8)which waves can travel through a vacuum?
a) light waves
b) ocean waves
c) sound waves
d) mechanical waves

9)all waves on the electromagnetic spectrum travel at the same speed in a vacuum. the speed of these waves in a vacuum is 3x108 m/s. as the wavelength of a wave doubles, how does the speed and frequency of the wave change?
a) the speed remains the same and the frequency is halved.
b) the frequency remains the same and the speed is halved.
c) the speed remains the same and the frequency is doubled.
d) the frequency remains the same and the speed is doubled.

10) the color produced by fireworks is all due to the chemicals inside of the firework itself. which of these would describe a firework that looked violet?
a) low energy and long wavelength
b) high energy and long wavelength
c) low energy and short wavelength
d) high energy and short wavelength

11)which electromagnetic radiation on the electromagnetic spectrum can be detected by the human eye?
a) radio
b) x-ray
c) microwaves
d) visible light

12)in what way are all sound waves and light waves similar?
a) they both transmit energy.
b) they both require a medium for transmission.
c) neither of them require a medium for transmission.
d) they both transmit matter without transmitting energy.

13)why does the frequency of a wave increase as the wavelength decreases?
a) because the wave speed remains constant
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b) because the amplitude of the wave must remain constant
c) because the frequency must get larger to increase the speed
d) because the wavelength must get smaller to decrease the speed

14)visible light represents a very small portion of the electromagnetic spectrum. radiation to the left in the image, such as microwaves, has a longer wavelength than visible light. radiation to the right has a shorter wavelength than is observable.

which radiation has a higher frequency than visible light?
a) x-rays
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b) infrared light
c) microwave radiation
d) the frequency of all radiation is the same

15)which of these examples would be classified as a longitudinal wave?
a) x-ray
b) red light
c) shock wave
d) radio wave

16)compare the sounds produce by wave a and wave b. the human ear would hear
a) wave a as a louder sound than wave b.
b) wave a as a higher pitched sound than wave b.
c) wave a and b with the same pitch, but wave a as louder.
d) wave b has a louder and higher pitched sound than wave a.

17)the image shown is known as the electromagnetic spectrum. the electromagnetic spectrum is a wide range of different forms of that travel as waves.
a) energy
b) heat
c) light
d) sound

18)during refraction, waves bend when they pass from one medium to another. the waves refract because their changes.
a) appearance
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b) intensity
c) size
d) speed

19)radio waves have the longest wavelengths on the electromagnetic spectrum and are generally used for communication. what explains why radio waves with the lowest frequency are used to transmit long distances while fm radio uses higher frequency radio waves?
a) low frequency radio waves have better sound quality so voices can be heard more clearly.
b) low frequency radio waves travel faster so they can transmit data quickly to distant locations.
c) low frequency radio waves have shorter wavelengths so they travel faster through denser material.
d) low frequency radio waves can transmit further without distortion but do not provide good sound quality.