Chapter 4

What part of the ear acts as the amplifier?

• cochlea

• nerves

• inner ear

• middle ear

Which produces sound that has the highest pitch?

• a tuba

• emergency siren

• lion's roar

• thunder

The speed of light is the slowest in which medium?

• cold air

• outer space

• pond water

• window glass

A shirt appears red under a white light. What color would it appear under a blue light?

• black

• blue

• red

• white

Which enables a person to see colors?

• cornea

• cone cells

• iris

• rod cells

The loudness of a wave depends on which of these?

• frequency

• pitch

• amplitude

• wavelength

What is the function of the cornea?

• changes the direction of the light that enters the eye

• controls the amount of light that enters the eye

• controls the shape of the lens

• enable eye to focus on near and distant objects

On the electromagnetic spectrum, which waves have wavelengths longer than the wavelengths of visible light?

• gamma rays

• radio waves

• ultraviolet waves

• X-rays

A reflected light ray makes an angle of 60 degrees to the normal. At what angle did the light ray strike the surface?

• 30 degrees to the normal

• 60 degrees to the normal

• parallel to the normal

• perpendicular to the normal

The inner ear changes vibrations to __________ that travel to the brain.

• bones

• hertz

• nerve signals

• pitch