Quiz 6 review Flashcards
Suppose that a radio signal takes 46 minutes and 34 seconds to reach a satellite from earth. This implies that the satellite is _____km awaay from earth. Express your answer as a pure number without units, and do not use scientific notion when answering.
838200000
The fact that light can be polarized implies that…
a. light is a longitudinal wave.
b. light is a transverse wave.
c. light is neither a longitudinal nor a transverse wave.
d. light is both a longitudinal and a transverse wave.
b. light is a transverse wave.
What is necessarily “waving [oscillating] in a light wave?
a. its direction of travel
b. electric fields
c. the molecules in the air
d. the molecules in the water
b. electric fields
What is the speed of light in vacuum?
300,000 km/s
Why do we use the same speed for light whether it is traveling in vacuum or in air?
a. the speed of light in air is not known, so one uses the speed of light in vacuum.
b. the speed of light in air is the same as it is in vacuum.
c. the speed of light in air is only about 0.03% less than it is in vacuum.
d. The speed of light in air is only about 0.03% more than it is in vacuum.
c. The speed of light in air is only about 0.03% less than it is in vacuum.
In which of the following media does light travel slowest?
a. air.
b. vacuum.
c. water.
d. light travels at the same speed in all of the media listed
c. water
A light wave passes from water into vacuum. Which of the following is correct?
a. neither the wave’s speech nor its wavelength is affected by this transition.
b. the wave slows down, and its wavelength increases.
c. the wave speeds up, and its wavelength decreases.
d. the wave speeds up, and its wavelength increases.
d. the wave speeds up, and its wavelength increase.
As we add more and more different wavelengths to a bean of light, the saturation…
a. remains the same.
b. the answer cannot determined without knowing which wavelengths are being added.
c. increases.
d. decreases.
d. decreases.
When unpolarized light is sent through a polarizing filter, the intensity is decreased by 50%. if the resultant polarized light is then send through a second polarizing filter…
a. it is impossible to answer this question without knowing the orientations of the two filters.
b. no light passes through the second filter.
c. the intensity decreases by another 50%.
d. the intensity is unchanged.
a. it is impossible to answer this question without knowing the orientations of the two filters.
When unpolarized light is sent through two polarizing filters, the intensity is decreased to zero. This implies that the second polarizing filter is oriented…
a. the same way as the first filter.
b. perpendicular to the first filter.
c. neither (a) nor (b) is correct since such a situation is impossible.
d. neither (a) not (b) is correct; the second filter must be oriented at some other angle.
b. perpendicular to the first filter.
Which of the following are true (choose all that apply)?
a. sound can travel through air.
b. light can travel through air.
c. sound can travel through water.
d. light can travel through vacuum.
e. light can travel through water.
f. sound can travel through a vacuum.
a. sound can travel through air.
b. light can travel through air.
c. sound can travel through water.
d. light can travel through water.
e. light can travel through water.
Which of the following statements are true (choose all that apply)?
a. microwaves are examples of electromagnetic radiation.
b. visible light is an example of electromagnetic radiation.
c. visible light has a frequency much lower than that of electromagnetic radiation.
d. visible light does not involve electromagnetic oscillations.
e. microwaves have frequencies much lower than that of electromagnetic radiation.
f. visible light has a frequency much higher than that of electromagnetic radiation.
a. microwaves are examples of electromagnetic radiation.
b. visible light is an example of electromagnetic radiation.
A certain beam of light has frequency 401 THz. What is the wavelength of this light (IN nm) as it travels through air? Express your answer as a pure number, without units.
747
