PHYS 1210- EXAM 3 HW

A standing wave occurs when A) a wave reflects upon itself. B) the amplitude of a wave exceeds its wavelength. C) the speed of the wave is zero or near zero. D) two waves overlap.

A) a wave reflects upon itself.

The speed of sound in air varies with _______. A) air temperature B) speed of the source C) pitch D) frequency

A) air temperature

The inside surface of a glass window becomes wet when the temperature outside is _______. A) colder B) warmer C) either warmer or colder D) almost exactly the same as on the inside

A) colder

When heat is added to boiling water, its temperature A) does not change. B) decreases. C) increases.

A) does not change.

A Doppler effect occurs when a source of sound moves A) either towards you or away from you. B) towards you. C) in a circle around you. D) away from you.

A) either towards you or away from you.

When we speak about heat, we refer to _______. A)energy in transit B) transfer of kinetic energy C) temperature D) work

A) energy in transit

To turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add A) energy. B) time. C) force. D) temperature. E) It can't be done - water is always warmer than that.

A) energy.

Energy transfer by convection is primarily restricted to A) fluids. B) liquids. C) solids. D) gases. E) none of these

A) fluids.

sound source approaches a stationary listener, the listener experiences an increase in sound _______. A) frequency B) speed C) wavelength D) speed, frequency, and wavelength

A) frequency

When you touch a cold piece of ice with your finger, energy flows A) from your finger to the ice. B) from the ice to your finger. C) actually, both ways.

A) from your finger to the ice.

For increased atmospheric pressure, the boiling temperature of a liquid A) goes up. B) goes down. C) remains at 100 degrees C.

A) goes up.

Refraction of sound occurs with changes in wave _______. A) speed B) frequency C) amplitude D) temperature

A) speed

Heat energy travels from an object with a high A) temperature to an object with a lower temperature. B) internal energy to an object with a lower internal energy. C) Both of these, for they say essentially say the same thing. D) None of the above choices are true.

A) temperature to an object with a lower temperature.

The moderate temperatures of islands throughout the world has much to do with water's A) high evaporation rate. B) high specific heat. C) vast supply of internal energy. D) absorption of solar energy. E) poor conductivity.

B) high specific heat.

Forced vibrations mainly occur in _______. A) sounding boards B) tuning forks C) wind instruments D) guitar strings

A) sounding boards

Which could burn a boy scout the most? A) 100 g of steam at 100 degrees C B) 100 g of water at 100 degrees C C) Both would be equally damaging.

A) 100 g of steam at 100 degrees C

Water is most dense at _______. A) 4°C B) 0°C C) 100°C D) less than 0°C

A) 4°C

Which of these has the highest specific heat capacity? A) Water B) Iron C) Soil D) Silver

A) Water

Near the top of a mountain, water in an open pot boils at A) a lower temperature than at sea level. B) the same temperature as at sea level. C) a higher temperature than at sea level. D) None of the above choices are true.

A) a lower temperature than at sea level.

A good heat conductor is A) a poor insulator. B) a good insulator. C) neither a poor nor a good insulator.

A) a poor insulator.

Standing waves are produced by _______. A) interference B) diffraction C) frequency changes D) amplitude changes

A) interference

When an iron ring is heated, the hole becomes A) larger. B) smaller. C) neither smaller nor larger. D) either smaller or larger, depending on the ring thickness.

A) larger.

Boiling can occur in cold water when _______. A) pressure is sufficiently lowered B) sub-zero temperatures are achieved C) concentration and physics come together D) pressure is sufficiently increased

A) pressure is sufficiently lowered

Heat travels from the Sun to the Earth by the process of _______. A) radiation B) convection C) conduction D) conduction and convection, though radiation is greater

A) radiation

The planet Earth loses heat mainly by A) radiation. B) convection. C) conduction. D) all of these

A) radiation.

When liquids change to a solid state, they A) release energy. B) absorb energy. C) neither absorb nor release energy. D) both absorb and release energy.

A) release energy.

When a gas is changed to a liquid state, the gas A) releases energy. B) absorbs energy. C) neither releases nor absorbs energy. D) both releases and absorbs energy.

A) releases energy.

Evaporation is a cooling process because A) the more energetic molecules are able to escape the liquid. B) of conduction and convection. C) heat is radiated during the process. D) the temperature of the remaining liquid decreases. E) none of these

A) the more energetic molecules are able to escape the liquid.

The higher the temperature of an object A) the shorter the wavelengths it radiates. B) the longer the wavelengths it radiates. C) makes no difference in the wavelengths it radiates

A) the shorter the wavelengths it radiates.

The fact that a thermometer "takes its own temperature" illustrates A) thermal equilibrium. B) energy conservation. C) the fact that molecules are constantly moving. D) the difference between heat and internal energy.

A) thermal equilibrium.

Which defines temperature - translational kinetic energy, rotational kinetic energy, vibrational kinetic energy, or all of these? A) translational kinetic energy B) vibrational kinetic energy C) rotational kinetic energy D) all of the above

A) translational kinetic energy

Most energy transfer occurs in water when it _______. A) vaporizes B) freezes C) increases from its melting temperature to its boiling temperature D) melts

A) vaporizes

A wiggle in time is a A) vibration. B) wave. C) both D) neither

A) vibration.

In a longitudinal wave the compressions and rarefactions travel in A)the same direction. B) opposite directions. C) a vacuum.

A)the same direction.

Which has the longer period, a short or a long pendulum? A) a short pendulum B) a long pendulum

B) a long pendulum

The amount of heat needed to raise the temperature of 1 gram of water by 1°C is _______ A) 1 newton B) 1 calorie C) 1 joule or 1 calorie, as both are the same D) 1 joule

B) 1 calorie

How many vibrations per second are associated with a 101-MHz radio wave? A) more than 101,000,000 B) 101,000,000 C) less than 101,000,000

B) 101,000,000

What are the temperatures for freezing water and boiling water on the Kelvin temperature scale? A) 0K for freezing water; 100K for boiling water B) 273K for freezing water; 373K for boiling water C) 32K for freezing water; 212K for boiling water

B) 273K for freezing water; 373K for boiling water

A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is A) 1800 hertz and it travels at 2 m/s. B) 60 hertz and it travels at 30 m/s. C) 30 hertz and it travels at 60 m/s.

B) 60 hertz and it travels at 30 m/s.

Changes of phase almost always require _______. A) an absence of molecular contact B) a transfer of energy C) a condition of thermal equilibrium D) electron transfer

B) a transfer of energy

Evaporation is a cooling process and condensation is A) a cooling process also. B) a warming process. C) neither a warming nor cooling process.

B) a warming process.

Objects that radiate relatively well A) reflect radiation relatively well. B) absorb radiation relatively well. C) both of these D) neither of these

B) absorb radiation relatively well.

When a solid is changed to a liquid state, the solid A) releases energy. B) absorbs energy. C) neither releases nor absorbs energy. D) both releases and absorbs energy.

B) absorbs energy.

The vibrations along a longitudinal wave move in a direction _______. A) perpendicular to the wave B) along and parallel to the wave C) both along and perpendicular to the wave D) neither along nor perpendicular to the wave

B) along and parallel to the wave

The vibrations of a longitudinal wave move in a direction A) at right angles to the direction of wave travel. B) along the direction of wave travel. C) that changes with speed.

B) along the direction of wave travel.

When air rapidly expands, its temperature normally _______. A) remains unchanged B) decreases C) is unaffected, but not always D) increase

B) decreases

Warm air rises because faster-moving molecules tend to move to regions of less A) density. B) density and less pressure. C) pressure.

B) density and less pressure.

Thermal conduction mostly involves the motion of _______. A) neutrons B) electrons C) atoms D) air molecules

B) electrons

The pitch of sound is most closely related to _______. A) its speed B) frequency C) wavelength D) amplitude

B) frequency

Microscopic slush in water tends to make the water density A) no change B) less. C) greater.

B) less.

A substance that heats up relatively quickly has a... A) low conductivity. B) low specific heat. C) high conductivity. D) high specific heat.

B) low specific heat.

The vibrations along a transverse wave move in a direction _______. A) along the wave B) perpendicular to the wave C) both along with and perpendicular to the wave D) neither along with nor perpendicular to the wave

B) perpendicular to the wave

The purpose of a pressure cooker is to _______. A) lessen pressure while cooking B) prevent cooling from occurring C) quicken heating D) lengthen the time of cooking

B) prevent cooling from occurring

Caruso is said to have made a crystal chandelier shatter with his voice. This is a demonstration of A) an echo. B) resonance. C) interference. D) beats. E) sound refraction.

B) resonance.

Which of the following is not a transverse wave? A) light B) sound C) radio D) all of these E) none of these

B) sound

Sound travels faster in A) air. B) steel. C) a vacuum. D) water. E) Sound travels at about the same speed in all of the above media.

B) steel.

Red light has a longer wavelength than violet light. Which has the greater frequency? A) red light B) violet light

B) violet light

The temperature of absolute zero is stated as _______. A)273 K B) −273°C C) 32°C D) 4 kelvin

B) −273°C

If the frequency of a particular wave is 20 Hz, its period is _______. A) more than 20 seconds B) 20 seconds C) 1/20 second D) also 20 Hz

C) 1/20 second

Most energy transfer occurs when 1 gram of H2O changes from _______. A) 0°C ice to 0°C water B) 0°C water to 100°C boiling water C) 100°C boiling water to 100°C steam D) any of these, for all involve the same amount of energy

C) 100°C boiling water to 100°C steam

The beat frequency produced when a 240 hertz tuning fork and a 246 hertz tuning fork are sounded together is A) 245 hertz. B) 12 hertz. C) 6 hertz. D) 240 hertz.

C) 6 hertz.

Heat energy is measured in units of A) joules. B) calories. C) Choices A and B are both true. D) Choices A and B are both false.

C) Choices A and B are both true.

What happens to the frequency of the wave if you increase the wavelength, keeping the velocity of the wave constant? A) The frequency increases. B) The frequency stays the same. C) The frequency decreases.

C) The frequency decreases.

How can you double the frequency of a wave if you have control over both the wavelength and the wave velocity? A) The only way is to do this is to halve the wavelength, keeping the wave speed constant. B) The only way is to do this is to double the velocity, keeping the wavelength constant. C) You can either halve the wavelength, keeping the wave speed constant; or double the wave speed, keeping the wavelength constant.

C) You can either halve the wavelength, keeping the wave speed constant; or double the wave speed, keeping the wavelength constant.

Like a transverse wave, a longitudinal wave has A) amplitude, wavelength, and speed. B) amplitude, frequency, and wavelength. C) amplitude, frequency, wavelength, and speed. D) amplitude, frequency, and speed. E) wavelength, speed, and frequency.

C) amplitude, frequency, wavelength, and speed.

The vibrations of a transverse wave move in a direction A) along the direction of wave travel. B) that changes with speed. C) at right angles to the direction of wave travel.

C) at right angles to the direction of wave travel.

Boiling is evaporation that mainly occurs _______. A) when water becomes overly hot B) at the surface of water C) below the surface and throughout water D) at the bottom of a container of heated water

C) below the surface and throughout water

We feel uncomfortably warm on a muggy day because water molecules are A) evaporating and condensing on our bodies at the same rate. B) evaporating from our moist bodies. C) condensing on our bodies.

C) condensing on our bodies.

A good absorber of radiation is a A) poor emitter of radiation. B) good reflector. C) good emitter of radiation. D) none of these

C) good emitter of radiation.

Steam burns are more damaging than burns caused by boiling water because steam A) has more energy per kilogram than boiling water. B) gives up additional energy when it condenses. C) has more energy per kilogram than boiling water, and gives up additional energy when it condenses.

C) has more energy per kilogram than boiling water, and gives up additional energy when it condenses.

Which of the following normally warms up fastest when heat is applied? A) wood B) glass C) iron D) water E) All of the above choices are equally true.

C) iron

Your feet feel warmer on a rug than on a tile floor because a rug A) for the same mass has more internal energy than tile. B) is usually warmer than tile. C) is a better insulator than tile. D) all of these E) none of these

C) is a better insulator than tile.

Hot sand cools off faster at night than do plants and vegetation. This indicates that the specific heat capacity for sand is _______. A) likely the same as that of plants B) more than that of plants C) less than that of plants D) unrelated to rate of cooling

C) less than that of plants

Metals are both good heat conductors and good electrical conductors because of the A) similarity between thermal and electrical conductive properties. B) high elasticity of metals. C) looseness of outer electrons in metal atoms. D) ability of metals to transfer energy easily. E) relatively high densities of metals.

C) looseness of outer electrons in metal atoms.

We are warmed by condensation because water molecules in the air that strike our bodies A) form an insulating layer on our bodies. B) gain kinetic energy as they change state. C) transfer some of their kinetic energy to us.

C) transfer some of their kinetic energy to us.

A common source of wave motion is a A) wave pattern. B) region of variable high and low pressure. C) vibrating object. D) harmonic object. E) none of these

C) vibrating object.

Which of these is the largest amount of energy? A) 100 calories B) 10 calories C) 5 joules D) 1 Calorie

D) 1 Calorie

Which of these cites the lowest temperature? A) 0° C B) 32°F C) 273 K D) 270 K

D) 270 K

Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is A) 30 m. B) 300 m. C) 0.003 m. D) 3.0 m. E) none of these

D) 3.0 m.

If a certain material heats up quickly and cools down quickly, the material has _______. A) no specific heat to speak of B) something besides specific heat that is different C) a high specific heat D) a low specific heat

D) a low specific heat

Interference is a phenomenon that occurs primarily in _______. A) water waves B) sound waves C) light waves D) all kinds of waves

D) all kinds of waves

Substances absorb heat energy by the process of A) conduction. B) radiation. C) convection. D) all of these.

D) all of these.

When the temperature of a strip of iron is increased, the length of the strip _______. A) decreases B) may increase or decrease C) decreases in width as it gets longer D) also increases

D) also increases

Sound travels from one place to another mainly in a series of _______. A) rarefactions B) compressions C) humps D) compressions and rarefactions

D) compressions and rarefactions

_______ travels in a wave from one location to another. A) amplitude B) wavelength C) frequency D) energy

D) energy

Thermal convection applies mainly to _______. A) conductors B) radiant energy C) insulators. D) fluids

D) fluids

When your foot stands on a tile floor, thermal energy always flows _______. A) from the tile to your foot B) from your foot to the tile C) upward D) from either your foot or the tile depending on the temperature of the tile

D) from either your foot or the tile depending on the temperature of the tile

Condensation is a change of phase _______. A) from liquid to gas B) from solid or liquid to gas C) without energy transfer D) from gas to liquid

D) from gas to liquid

Evaporation is a change of phase _______. A) without energy transfer B) from gas to liquid C) from solid or liquid to gas D) from liquid to gas

D) from liquid to gas

The relation ƒ ~ T tells us that high-temperature sources emit electromagnetic waves of _______. A) long wavelengths B) high penetrating power C) low frequency D) high frequency

D) high frequency

Melting and freezing are _______. A) one and the same at the atomic level B) not related to thermal processes C) processes that bypass energy transfers D) opposite processes

D) opposite processes

A hot dog pants A) to bring more oxygen into its lungs. B) to impress dogs of the opposite sex. C) for no particular reason - some things just happen. D) to help evaporation occur in its mouth and bronchial tract.

D) to help evaporation occur in its mouth and bronchial tract.

The speed of a wave can be found by multiplying its frequency by its _______. A) period B) density C) amplitude D) wavelength

D) wavelength

A reverberation occurs when sound undergoes _______. A) changes in frequency B) amplified acoustics D) repeated refractions E) multiple echoes

E) multiple echoes

Which doesn't belong to the same family? A) infrasonic waves B) shock waves C) longitudinal waves D) ultrasonic waves E) radio waves

E) radio waves

The frequency of a simple pendulum depends on A) its length. B) its mass. C) the acceleration due to gravity. D) all of these E) two of these

E) two of these

The source of every sound is something that is A) accelerating. B) undergoing simple harmonic motion. C) moving. D) a net emitter of energy. E) vibrating.

E) vibrating

If a pendulum is shortened, does its frequency increase or decrease? decrease increase does not change What about its period? increase decrease does not change

increase; decrease

Does the period of a pendulum depend on the mass of the bob? Yes or no On the length of the string? yes or no

no; yes