35.A sound wave travels from air into the ground. What happens to the speed of the wave?

1. it decreases
2. it increases
3. it stays the same
4. cannot be determined

36. The Doppler Effect results in......

a. Lower frequency as an object moves away from you

b. Lower amplitude as an object moves towards you

c. Frequency doesn't change

37. Sound travels FASTEST through which of these materials?

a. Air

b. Empty space

c. Metal

d. Water

38. A sound has high pitch, which means it has a higher frequency. This means when you hear the sound...

a. more waves hit your ears per second

b. bigger waves hit your ears

c. less waves hit your ears per second

d. longer waves hit your ears

39.Which way of communicating will NOT work for astronauts in outer space?

a. ringing a bell

b. flashing a light

c. using a radio

d. waving a hand

40.What happens when you increase the amplitude of a sound?

1. it makes the sound louder
2. it makes the sound travel faster
3. it makes the sound softer
4. it changes the pitch or note of the sound

41.Which of the following is NOT true of electromagnetic waves?

1. they all travel at the speed of light
2. they can travel through a vacuum
3. they are made up of oscillating electric and magnetic fields
4. they are all dangerous to humans

42. A prism can be used to...

a. measure the speed of light

b. separate visible light into colors

c. make a beam of light brighter

d. make UV light visible

43. A student placed a pencil in a cup of water. The pencil appears broken because light...

a. always travels in a straight line.

b. bends when it passes through water.

c. makes the water in the glass evaporate.

d. reflects the pencil on the water's surface.

44. What particles make up light?

a. electrons

b. protons

c. photons

d. neutrons

45. The primary purpose of polarized sunglasses is to:

a. block ultraviolet rays

b. block infrared rays

c. block glare from reflections

d. to look cool

46.Electromagnetic waves have the same speed but different:

1. frequency & medium
2. wavelength & frequency
3. medium & wavelength
4. color & medium

47.The full spectrum of light energy is called the__________

1. broad spectrum
2. electromagnetic spectrum
3. helium spectrum
4. natural light spectrum

48. Why do we see objects as white?

a. They absorb all light

b. They reflect all light

c. They absorb some light and reflect some light

49. If you are wearing a yellow shirt, what is true of the light that strikes it?

1. Yellow is absorbed; everything else is reflected
2. Yellow is reflected; everything else is absorbed
3. All colors are reflected
4. All colors are absorbed

50.Things make shadows because they ______ light.

1. block
2. pass