Download State one piece of evidence supporting the wave model of light and

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State one piece of evidence supporting the wave model of light and one piece of evidence
supporting the particle model of light.
Ans: Wave—light diffracts, light interferes. Particle—light travels without a medium, the
photoelectric effect.
2. Name the regions of the electromagnetic spectrum from shortest wavelength to longest.
Ans: Cosmic rays, gamma rays, X-rays, ultraviolet, visible light (violet-red), infrared,
microwaves, radio waves
3. Which photons have greater energy, those associated with microwaves or those associated
with visible light?
Ans: Visible light, because visible light has a higher frequency and frequency is proportional
to energy.
4. Which band of the electromagnetic spectrum has the following?
a. the lowest frequency
Ans: radio waves
b. the shortest wavelength
Ans: cosmic rays (“gamma rays” is ok)
c. the greatest energy
Ans: cosmic rays ( “ “ )
d. the least energy
Ans: radio waves
5. You and a friend are looking at the stars and you notice two stars close together, one is
bright the other is fairly dim. Your friend comments that the bright star must emit much
more ligh than the dimmer star. Is this necessarily right? Explain your answer.
Ans: No, the star appears brighter because its light is more intense. This could be due to it
producing more light than its neighbor or it might simply be closer than its neighbor allowing
less time for the light to diffuse. A dim star 10 light-years away, might appear brighter than
a bright star 10,000 light-years away.