Physics Exam 3

Compared to the radio waves used in normal radio broadcasts, the microwaves used for satellite transmissions have A) higher frequencies and shorter wavelengths. B) higher frequencies and longer wavelengths. C) lower frequencies and shorter wavelengths. D) lower frequencies and longer wavelengths

A) Higher frequencies and shorter wavelengths

Light is emitted when electrons A) jump down in energy level B) disappear then reappear C) jump up in energy level D) turn into positrons

A) jump down in energy level

How does the new self-healing membrane filter operate? A) Passes lager particles with higher Kinetic energy B) Traps only bacteria C) Washes as it filters

A) passes larger particles with higher Kinetic energy

How are we able to infer the existence of liquid water on the surface of Mars. A) Satellite Images of the surface show geological features like river deltas and estuaries. B) Robots on the surface have drilled for water C) We can measure tides

A) satellite images of the surface show geological features like river deltas and estuaries

What feature allows the Tesla car to have exceptional resistance to roll over in a crash? A) The center of gravity is very low. B) A spinning gyroscope C) High voltage

A) the center of gravity is very low

A radio tuner works because A) the charge sloshes back and forth in the tank circuit at a certain frequency and the station being tuned in to must be very near that frequency. B) the electric field in the capacitor must be the same size as that of the radio signal. C) the magnetic field in the inductor must be the same size as that of the signal. D) the capacitor dimensions must be the same size as the signal wavelength

A) the charge sloshes back and forth in the tank circuit at a certain frequency and the station being tuned in to must be very near that frequency

What method is being studied to extract oils from porous stone? A) Water is used to push the oil from the stone. B) A wringer system C) A centrifuge

A) water is used to push the oil from the stone

Three different lasers are emitting steady beams of light. Each beam consists of countless copies a single original photon of light. However, not all colors can be emitted by a laser. Which of the following choices is possible for these three lasers? A) Yellow, green, and blue light B) Green, blue, and white light C) Blue, white, and yellow light D) White, yellow, and green light

A) yellow, green, and blue light

What does FM stand for? A) Far More sound B) Full Music C) Frequency Modulation D) Frequency Modification

C) Frequency Modulation

Which answer has the colors in order from the shortest wavelength to the longest? A) Red Green Blue B) Red Blue Green C) Blue Red Green D) Blue Green Red

D) Blue Green Red

What colors are the eye's color-sensing cells most sensitive to? A) red, green, violet B) red, yellow, blue C) orange, green, violet D) red, green, blue

D) red, green, blue

What natural material is being studied for use as a sponge to collect oil spills at sea? A) Balsa wood B) Feathers C) Paper towels

A) Balsa Wood

How can bacteria communicate? A) Chemical signals B) Cell phones C) Bacterial phones D) They use Bactinada as a language

A) Chemical Signals

Which answer has the colors in order from the lowest energy to the highest? A) Red Green Blue B) Red Blue Green C) Blue Red Green D) Blue Green Red

A) Red Green Blue

What new method is applied to measure ice sheet thickness in Greenland? A) Satellite imagery B) Seismic waves C) Core samples

A) Seismic waves

What type of transportation is hydrogen fuel cells applied to in France? A) Trains B) Flying cars C) Boats

A) Trains

What device is being developed to allow us to observe underwater life in situ? A) Underwater microscope B) Underwater television C) Submersible drones

A) Underwater microscopes

What method is being studied to detect oil spills under sea ice? A) Use of SONAR mounted on underwater autonomous vehicles B) Training dolphins to smell oil C) Drilling through the ice

A) Use of SONAR mounted on underwater autonomous vehicles

The tubes in fluorescent lamps have a white powder on their inner surfaces. This powder A) slows down the white light produced by the gas atoms inside the tube so that less of that white light reflects as it passes through the walls of the tube. B) conducts electricity from one electrode to the other and emits visible light as current passes through it. C) absorbs ultraviolet light and uses the energy from that light to produce visible light. D) scatters the white light produced by the gas atoms inside the tube so that it is both vertically and horizontally polarized and doesn't cause glare.

A) absorbs ultraviolet light and uses the energy form that light to produce visible light

What mew method is being applied to measure air quality? A) Cell phone net works B) Training birds to detect pollution C) Line of sight measurements

A) cell phone net works

Ultraviolet light causes damage to your skin while infrared light does not because A) ultraviolet light has a longer wavelength than infrared light. B) a photon of ultraviolet light carries much more energy than a photon of infrared light. C) ultraviolet light has more photons than infrared light. D) ultraviolet light is more intense than infrared light.

B) a photon of ultraviolet light carries much more energy than a photon of infrared light

Radio waves travel through empty space A) slower than visible light B) at the same speed as visible light C) as fast as the sound moves D) faster than visible light

B) at the same speed as visible light

Electric fields come from A) electric charge only. B) electric charge or changing magnetic fields. C) changing magnetic fields only. D) electric charge or any magnetic field.

B) electric charge or changing magnetic fields

"LED" stands for A) light emitting device B) light emitting diode C) light electromagnetic device D) light electric diode

B) light emitting diode

Microwaves have A) similar frequencies to visible light B) lower frequencies than visible light C) no frequency D) higher frequencies than visible light

B) lower frequencies than visible light

White LEDs are A) LEDs that emit white light. B) ultraviolet LEDs with phosphors inside. C) infrared LEDs that heat up phosphors D) yellow LEDs with a white coating on the inside.

B) ultraviolet LEDs with phosphors inside

Why does FM radio sound richer than AM radio? A) FM is higher frequency. B) FM electronics produce better sound reproduction. C) FM has a larger bandwidth. D) FM antennas need not be as tall as AM antennas.

C) FM has a larger bandwidth

In what way is light from a sodium vapor lamp like sunlight? A) They both are luminescing. B) They both are monochromatic. C) They both are created by excited electrons. D) They both include all colors.

C) They are both created by excited electrons

Microwaves have speeds A) greater than visible light. B) less than visible light. C) equal to visible light. D) 55 miles per hour; it's still the law.

C) equal to visible light

Which of the following would not be likely to cause an FM radio signal to cut out? A) tall buildings B) driving over pronounced hills C) fog and rain D) being inside a metal room

C) fog and rain

In a typical laser, the right color of light bounces back and forth between two mirrors and A) is ignored by the laser medium. B) is amplified by the mirrors. C) is amplified by the excited atoms in the laser medium. D) is de-amplified by the laser medium.

C) is amplified by the excited atoms in the laser medium

You can get a sunburn on your face from sunlight reflecting off snow because A) It is the cold weather — not the light -- that burns your face. B) The snow brightens the reflected light. C) It is the ultraviolet light that burns you, and it reflects and scatters off the snow also. D) The snow adds high energy light through resonance before it reflects.

C) it is the ultraviolet light that burns you, and it reflects and scatters off the snow also

"Laser" stands for A) light amplification through spontaneous emission of radiation. B) let's all study electromagnetic waves and refraction. C) light amplification through stimulated emission of radiation. D) light attenuation through stimulated emission of radiation.

C) light amplification through stimulated emission of radiation

Microwaves have A) shorter wavelengths than visible light B) comparable wavelengths to visible light C) longer wavelengths than visible light D) no wavelength at all

C) longer wavelengths than visible light

If you put an egg in a microwave oven, it will become very hot. But if you put a dehydrated egg (a dried egg containing no water. in the microwave oven, the egg will not be affected because A) the dehydrated egg reflects the microwaves while the normal egg does not. B) the dehydrated egg is much less dense than a normal egg and doesn't conduct heat well. C) microwaves transfer heat to food principally through its water molecules. D) the dehydrated egg is too dry to have a temperature. Only foods containing water or oil can actually become hot

C) microwaves transfer heat to food principally through its water molecules

A mercury street light gets brighter as it warms up because A) the voltage across it is increasing. B) the liquid mercury is flowing around more, making better connections. C) more mercury is vaporizing. D) it is getting darker outside and so it just looks brighter

C) more mercury is vaporizing

Soap bubbles have their beautiful colors when illuminated with white light because A) of dispersion. B) the light interferes within the bubble. C) the light rays reflecting off the top and bottom surfaces interfere. D) light rays reflecting off the bottom mix and interfere with each other

C) the light rays reflecting off the top and bottom surfaces interfere

Microwaves can't get through the metal screen in a microwave oven, but light can because A) light travels faster than microwaves. B) the wavelength of visible light is about the same size as the holes. C) the wavelength of microwaves is about the same size as the holes. D) the screen acts like a resistor, absorbing the microwaves and not reflecting them.

C) the wavelength of the microwaves is about the same size as the holes

What does AM stand for? A) Amplification B) Antenna Modification C) Antenna Modulation D) Amplitude Modulation

D) Amplitude Modulation

What effect causes the sky to appear blue? A) Destructive Interference B) Dispersion C) Impedance mismatch D) Rayleigh scattering

D) Rayleigh scattering

What type of circuit is used to tune a radio? A) inductance circuit B) radio circuit C) antennae circuit D) tank circuit

D) Tank Circuit

Laser light is A) incandescent B) polarized C) incoherent D) coherent

D) coherent

An FM radio station instructs your radio receiver how to move its speaker cone by varying the A) amount of electric charge it pushes up and down its antenna. B) amplitude of the radio wave it produces. C) strength of the electric and magnetic fields in the radio wave it produces. D) frequency of the radio wave it produces.

D) frequency of the radio wave it produces

Light passing from air into a denser transparent medium will A) not change speed B) speed up C) none of these D) slow down

D) slow down

A laser's output color depends primarily on A) the power to it. B) how much lasing material is in the laser C) the energy gap between the lower laser level and ground state D) the energy gap between the upper and lower laser levels.

D) the energy gap between the upper and lower laser levels