Wave Optics

In the diagram, what does the arrow labeled D indicate?

• crest

• trough

• wavelength

• amplitude

In the diagram, what does the arrow labeled E indicate?

• crest

• trough

• wavelength

• amplitude

If it takes a waves 2.0 s to travel a distance of 10 meters, what is the wave speed?

• 0.2 m/s

• 5 m/s

• 12 m/s

• 20 m/s

If a wave is traveling at 15 m/s and has a frequency of 5.0 Hz, what is its wavelength?

• 0.33 m

• 3 m

• 20 m

• 75 m

The index of refraction of air is approximately...

• 0.5

• 1.0

• 1.5

• 2.0

A diffraction grating that has 2000 slits per centimetre is used to measure the wavelengths emitted by hydrogen gas. At what angle in the first order spectrum would you expect to find the violet line that has a wavelength of 434 nm?

Which of the following is necessary for light to propagate?

• A air

• B aether

• C matter

• D None of these are necessary.

What electromagnetic wave travels the fastest?

• microwave

• ultraviolet

• x­ray

• All travel at the speed of light ‘c’.

In a vacuum a particular light source gives off light waves with a measured wavelength of

2.0 X 10^­-7 m. What is the frequency of the light source?

• 6.67 X 10^­-15 Hz

• 6.0 X 10^-11 Hz

• 1.5 X 10¹⁵ Hz

• not enough information

Given a scenario in which the sun is encapsulated very quickly by a large blanket, how long would it take for the resulting darkness to reach Earth 1.5 X 10¹¹ m away?

• 0 s; It would happen instantaneously.

• 4.5 s

• 8.3 s

• 500 s