1. For light from two sources to be considered \"coherent\" their waves must hav

ID: 1416264 • Letter: 1

Question

1. For light from two sources to be considered "coherent" their waves must have the same... (select all that apply)

Wavelength

Frequency

Amplitude

Starting Phase

2. Which of the following contribute to making it difficult to see light interference in everyday (or night) phenomena? (Select all that apply)

Visible light has very small wavelengths.

Higher frequency light has shorter wavelengths.

Most light is not coherent.

The angle between interference minima is inversely proportional to slit width.

Moving objects cause light to doppler shift.

3. Which fact about waves explains why a diffraction grating is better for measuring wavelengths of light, than a double slit arrangement?

Wavelength is inversely proportional to frequency.

Wave speed is proportional to frequency.

Intensity is proportional to amplitude squared.

Frequency stays constant when waves change medium.

Intensity is inversely proportional to area.

4. Which of the following are examples of light interference that can be seen in everyday life? (Select all that apply)

White light reflects off of a DVD as patches of color.

White light is split into a "rainbow" after a storm.

Swirls of color are seen on an oily puddle.

Water in an indoor pool reflects ripple patterns of sunlight onto the ceiling.

White light spreads out in a cone after passing through a doorway.

Two wave sources are perfectly coherent if they have a constant phase difference and the same frequency.