The pitch of a sound is most closely related to the

• frequency of the sound waves.

• distance from the sound source.

• medium through which the sound travels.

• intensity of the sound.

When a sound wave strikes your eardrum, it causes forced vibrations that are transferred to the

• brain

• outer ear.

• longitudinal canal.

• hammer, anvil, and stirrup.

The structure within the cochlea containing hair cells that vibrate at different natural frequencies is the

• eardrum.

• basilar membrane.

• inner ear.

• hammer and anvil.

A sonar system measures distance by determining the

• density of a body of water.

• time it takes for sound to be absorbed.

• difference between regular sound waves and ultrasound.

• time it takes for sound waves to be reflected from a surface.

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Which type of electromagnetic waves has the highest energy?

• gamma rays

• ultraviolet light

• infrared

• microwaves

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Which type of electromagnetic radiation is used to kill cancer cells?

• microwaves

• gamma rays

• ultraviolet rays

• sunlight

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Radar works by sending a signal out from an air-traffic control tower that is

• analyzed by a Doppler scanner on the ground.

• reflected off a plane back to the control tower.

• increased in intensity as it passes through the atmosphere.

• scanned and analyzed by a receiver on board an airplane.

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The color that an object appears to be depends on the

• angle at which visible light is reflected off the object.

• use of additive rather than subtractive colors.

• wavelengths of visible light that reaches your eyes.

• speed with which visible light reaches it.

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When light moves from a material in which its speed is higher to a material in which its speed is lower, it is

• bent toward the normal.

• bent away from the normal.

• reflected off the boundary.

• changed into a virtual image.

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Light rays that pass through a lens change direction because

• of internal reflection.

• they are refracted.

• light is broken up into many different colors.

• virtual images always appear slightly larger than real images.

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