Physics Test 3 Ch 15-17 & 19-21
Which of these is the largest amount of energy? 10 calories 1 Calorie 5 joules 100 calories
1 Calorie
The amount of heat needed to raise the temperature of 1 gram of water by 1°C is _______. 1 newton 1 joule 1 joule or 1 calorie, as both are the same 1 calorie
1 calorie
If the frequency of a particular wave is 20 Hz, its period is _______. View Available Hint(s) 20 seconds also 20 Hz more than 20 seconds 1/20 second
1/20 second
Which could burn a boy scout the most? 100 g of steam at 100 degrees C 100 g of water at 100 degrees C Both would be equally damaging.
100 g of steam at 100 degrees C
Most energy transfer occurs when 1 gram of H2O changes from _______. 100°C boiling water to 100°C steam 0°C water to 100°C boiling water 0°C ice to 0°C water any of these, for all involve the same amount of energy
100°C boiling water to 100°C steam
How many vibrations per second are associated with a 101-MHz radio wave? 101,000,000 more than 101,000,000 less than 101,000,000
101,000,000
Which of these cites the lowest temperature? 32°F 0° C 270 K 273 K
270 K
Why is one able to walk on red-hot coals without getting one's feet burned? The coals are neither very hot, nor are they good conductors of heat. The coals are not as hot as they seem The coals are not good conductors of heat.
The coals are not good conductors of heat.
What happens to the frequency of the wave if you increase the wavelength, keeping the velocity of the wave constant? The frequency stays the same. The frequency decreases. The frequency increases.
The frequency decreases
What happens to the frequency of the wave if you increase the wave velocity, keeping the wavelength of the wave constant? The frequency neither increases nor decreases. The frequency decreases. The frequency increases.
The frequency increases
The inside surface of a glass window becomes wet when the temperature outside is _______. warmer almost exactly the same as on the inside colder either warmer or colder
colder
We feel uncomfortably warm on a muggy day because water molecules are... condensing on our bodies. evaporating and condensing on our bodies at the same rate. evaporating from our moist bodies.
condensing on our bodies
When air rapidly expands, its temperature normally _______. is unaffected, but not always remains unchanged decreases increases
decreases
Warm air rises because faster-moving molecules tend to move to regions of less... density. density and less pressure. pressure.
density and less pressure
When heat is added to boiling water, its temperature... increases. decreases. does not change.
does not change
A Doppler effect occurs when a source of sound moves away from you. towards you. either towards you or away from you. in a circle around you.
either towards you or away from you
Thermal conduction mostly involves the motion of _______. air molecules neutrons electrons atoms
electrons
To turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add... temperature. energy. time. force. It can't be done - water is always warmer than that.
energy
_______ travels in a wave from one location to another. wavelength energy amplitude frequency
energy
When we speak about heat, we refer to _______. transfer of kinetic energy energy in transit temperature work
energy in transit
Energy transfer by convection is primarily restricted to... fluids. liquids. gases. solids. none of these
fluids
Thermal convection applies mainly to _______. radiant energy fluids insulators. conductors
fluids
When a sound source approaches a stationary listener, the listener experiences an increase in sound _______` wavelength speed frequency speed, frequency, and wavelength
frequency
When your foot stands on a tile floor, thermal energy always flows _______. from the tile to your foot upward from your foot to the tile from either your foot or the tile depending on the temperature of the tile
from either your foot or the tile depending on the temperature of the tile
Condensation is a change of phase _______. without energy transfer from gas to liquid from liquid to gas from solid or liquid to gas
from gas to liquid
Evaporation is a change of phase _______. from solid or liquid to gas from liquid to gas without energy transfer from gas to liquid
from liquid to gas
When you touch a cold piece of ice with your finger, energy flows... from your finger to the ice. actually, both ways. from the ice to your finger.
from your finger to the ice
When liquids change to a solid state, they... absorb energy. release energy. neither absorb nor release energy. both absorb and release energy.
release energy
When a gas is changed to a liquid state, the gas... releases energy. absorbs energy. neither releases nor absorbs energy. both releases and absorbs energy.
releases energy
Which of the following is not a transverse wave? radio sound light all of these none of these
sound
Heat energy travels from an object with a high... internal energy to an object with a lower internal energy. temperature to an object with a lower temperature. Both of these, for they say essentially say the same thing. None of the above choices are true.
temperature to an object with a lower temperature.
What are the temperatures for freezing water and boiling water on the Kelvin temperature scale? 273K for freezing water; 373K for boiling water 32K for freezing water; 212K for boiling water 0K for freezing water; 100K for boiling water
273K for freezing water; 373K for boiling water
Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is... 0.003 m. 3.0 m. 300 m. 30 m. none of these
3.0 m
Water is most dense at _______. 4°C less than 0°C 100°C 0°C
4°C
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is... 30 hertz and it travels at 60 m/s. 1800 hertz and it travels at 2 m/s. 60 hertz and it travels at 30 m/s.
60 hertz and it travels at 30 m/s
What temperature scale are these things at? Water freezes into ice at 0. A typical room temperature is 24. Liquid water boils at 100
Celcius
Heat energy is measured in units of... joules. calories. Choices A and B are both true. Choices A and B are both false.
Choices A and B are both true
What temperature scale are these things at? A hot summer day might be 100. Ice cream is stored in freezers at 26.
Fahrenheit
Which of the following would best describe the conductive properties of wood? It is a good conductor. It is neither a good conductor nor a good insulator. It is a good insulator.
It is a good insulator
What happens to the conductive properties of wood when it gets very hot? It will change from being a good conductor to becoming a good insulator. It will continue to remain a good conductor. It will continue to remain a good insulator. It will change from being a good insulator to becoming a good conductor.
It will continue to remain a good insulator
What temperature scale are these things at? The coldest possible temperature is 0. Water boils into gas phase at 373.15
Kelvin
There is twice as much molecular kinetic energy in 2 liters of boiling water as in 1 liter of boiling water. Which will be the same for both? Temperature Thermal energy A and B Neither
Temperature
How would you walk on red-hot coals without getting your feet burned? You can either walk slowly or walk fast. Walk fast. Walk slowly.
Walk fast
Which of these has the highest specific heat capacity? Silver Water Iron Soil
Water
How can you double the frequency of a wave if you have control over both the wavelength and the wave velocity? You can either halve the wavelength, keeping the wave speed constant; or double the wave speed, keeping the wavelength constant. The only way is to do this is to halve the wavelength, keeping the wave speed constant. The only way is to do this is to double the velocity, keeping the wavelength constant.
You can either halve the wavelength, keeping the wave speed constant; or double the wave speed, keeping the wavelength constant.
If a certain material heats up quickly and cools down quickly, the material has _______. a high specific heat something besides specific heat that is different no specific heat to speak of a low specific heat
a low specific heat
Near the top of a mountain, water in an open pot boils at... a lower temperature than at sea level. a higher temperature than at sea level. the same temperature as at sea level. None of the above choices are true.
a lower temperature than at sea level
A good heat conductor is... a good insulator. a poor insulator. neither a poor nor a good insulator.
a poor insulator
Changes of phase almost always require _______. electron transfer an absence of molecular contact a condition of thermal equilibrium a transfer of energy
a transfer of energy
Evaporation is a cooling process and condensation is... a warming process. a cooling process also. neither a warming nor cooling process.
a warming process
A standing wave occurs when... a wave reflects upon itself. the amplitude of a wave exceeds its wavelength. two waves overlap. the speed of the wave is zero or near zero.
a wave reflects upon itself
If you are able to grab a hot pan and pull it out by the handle without burning yourself, what kind of handle must the pan have, and why? a wooden handle, because it is the better insulator a wooden handle, because it is the better conductor a metal handle, because it is the better conductor a metal handle, because it is the better insulator
a wooden handle, because it is the better insulator
Objects that radiate relatively well... reflect radiation relatively well. absorb radiation relatively well. both of these neither of these
absorb radiation relatively well.
When a solid is changed to a liquid state, the solid... absorbs energy. releases energy. neither releases nor absorbs energy. both releases and absorbs energy.
absorbs energy
Interference is a phenomenon that occurs primarily in _______. sound waves water waves light waves all kinds of waves
all kinds of waves
Substances absorb heat energy by the process of... conduction. radiation. convection. all of these
all of these
The vibrations along a longitudinal wave move in a direction _______. perpendicular to the wave along and parallel to the wave both along and perpendicular to the wave neither along nor perpendicular to the wave
along and parallel to the wave
The vibrations of a longitudinal wave move in a direction... at right angles to the direction of wave travel. along the direction of wave travel. that changes with speed.
along the direction of wave travel
When the temperature of a strip of iron is increased, the length of the strip _______. also increases decreases in width as it gets longer may increase or decrease decreases
also increases
Like a transverse wave, a longitudinal wave has... amplitude, wavelength, and speed. amplitude, frequency, and wavelength. amplitude, frequency, wavelength, and speed. amplitude, frequency, and speed. wavelength, speed, and frequency.
amplitude, frequency, wavelength, and speed
The vibrations of a transverse wave move in a direction... at right angles to the direction of wave travel. along the direction of wave travel. that changes with speed.
at right angles to the direction of wave travel
Boiling is evaporation that mainly occurs _______. at the bottom of a container of heated water at the surface of water when water becomes overly hot below the surface and throughout water
below the surface and throughout water
For increased atmospheric pressure, the boiling temperature of a liquid... remains at 100 degrees C. goes down. goes up.
goes up
A good absorber of radiation is a... good reflector. poor emitter of radiation. good emitter of radiation. none of these
good emitter of radiation
Steam burns are more damaging than burns caused by boiling water because steam... gives up additional energy when it condenses. has more energy per kilogram than boiling water. has more energy per kilogram than boiling water, and gives up additional energy when it condenses.
has more energy per kilogram than boiling water, and gives up additional energy when it condenses
The relation ƒ ~ T tells us that high-temperature sources emit electromagnetic waves of _______. long wavelengths high penetrating power low frequency high frequency
high frequency
The moderate temperatures of islands throughout the world has much to do with water's... vast supply of internal energy. high evaporation rate. high specific heat. absorption of solar energy. poor conductivity.
high specific heat
If a pendulum is shortened, does its frequency increase or decrease? increase decrease does not change What about its period? does not change decrease increase
increase; decrease
Standing waves are produced by _______. amplitude changes diffraction interference frequency changes
interference
Which of the following normally warms up fastest when heat is applied? wood iron water glass All of the above choices are equally true.
iron
Your feet feel warmer on a rug than on a tile floor because a rug... is usually warmer than tile. is a better insulator than tile. for the same mass has more internal energy than tile. all of these none of these
is a better insulator than tile
To say that body A has a higher temperature than body B is to say that body A has more... internal energy mass kinetic energy per particle potential energy
kinetic energy per particle
When an iron ring is heated, the hole becomes... larger. smaller. neither smaller nor larger. either smaller or larger, depending on the ring thickness.
larger
Microscopic slush in water tends to make the water density... no change greater. less.
less
Hot sand cools off faster at night than do plants and vegetation. This indicates that the specific heat capacity for sand is _______. less than that of plants more than that of plants unrelated to rate of cooling likely the same as that of plants
less than that of plants
Which has the longer period, a short or a long pendulum? a short pendulum a long pendulum
long pendulum
Metals are both good heat conductors and good electrical conductors because of the... high elasticity of metals. relatively high densities of metals. ability of metals to transfer energy easily. similarity between thermal and electrical conductive properties. Metals are both good heat conductors and good electrical conductors because of the high elasticity of metals. relatively high densities of metals. ability of metals to transfer energy easily. similarity between thermal and electrical conductive properties. looseness of outer electrons in metal atoms.
looseness of outer electrons in metal atoms.
A substance that heats up relatively quickly has a... high conductivity. high specific heat. low conductivity. low specific heat.
low specific heat
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
Melting and freezing are _______.` not related to thermal processes opposite processes one and the same at the atomic level processes that bypass energy transfers
opposite processes
The vibrations along a transverse wave move in a direction _______. perpendicular to the wave along the wave both along with and perpendicular to the wave neither along with nor perpendicular to the wave
perpendicular to the wave
Boiling can occur in cold water when _______. concentration and physics come together pressure is sufficiently lowered pressure is sufficiently increased sub-zero temperatures are achieved
pressure is sufficiently lowered
The purpose of a pressure cooker is to _______. quicken heating prevent cooling from occurring lengthen the time of cooking lessen pressure while cooking
prevent cooling from occuring
Heat travels from the Sun to the Earth by the process of _______. convection radiation conduction conduction and convection, though radiation is greater
radiation
The planet Earth loses heat mainly by... convection. radiation. conduction. all of these
radiation
If a red-hot thumbtack is immersed in warm water, the direction of heat flow will be from the... warm water to the red-hot thumbtack red-hot thumbtack to the warm water no heat flow not enough info
red-hot thumbtack to the warm water
Evaporation is a cooling process because... the temperature of the remaining liquid decreases. of conduction and convection. the more energetic molecules are able to escape the liquid. heat is radiated during the process. none of these
the more energetic molecules are able to escape the liquid.
In a longitudinal wave the compressions and rarefactions travel in... opposite directions. the same direction. a vacuum.
the same direction
The higher the temperature of an object... the shorter the wavelengths it radiates. the longer the wavelengths it radiates. makes no difference in the wavelengths it radiates
the shorter the wavelengths it radiates
The fact that a thermometer "takes its own temperature" illustrates... the difference between heat and internal energy. energy conservation. the fact that molecules are constantly moving. thermal equilibrium.
thermal equilibrium
A hot dog pants... to bring more oxygen into its lungs. to impress dogs of the opposite sex. for no particular reason - some things just happen. to help evaporation occur in its mouth and bronchial tract.
to help evaporation occur in its mouth and bronchial tract.
We are warmed by condensation because water molecules in the air that strike our bodies... gain kinetic energy as they change state. form an insulating layer on our bodies. transfer some of their kinetic energy to us.
transfer some of their kinetic energy to us
Which defines temperature - translational kinetic energy, rotational kinetic energy, vibrational kinetic energy, or all of these? rotational kinetic energy vibrational kinetic energy translational kinetic energy all of the above
translational kinetic energy
The frequency of a simple pendulum depends on... the acceleration due to gravity. its length. its mass. all of these two of these
two of these
Most energy transfer occurs in water when it _______. increases from its melting temperature to its boiling temperature melts freezes vaporizes
vaporizes
A common source of wave motion is a.. region of variable high and low pressure. harmonic object. wave pattern. vibrating object. none of these
vibrating object
A wiggle in time is a vibration. wave. both neither
vibration
Red light has a longer wavelength than violet light. Which has the greater frequency? red light violet light
violet light
The speed of a wave can be found by multiplying its frequency by its _______ wavelength amplitude period density
wavelength
The temperature of absolute zero is stated as _______. 32°C −273°C 273 K 4 kelvin
−273°C
