HW2 - Background Material, cont.

The villain in a movie grabs the hero's son and jumps onto a speeding train. If the train is moving away from the hero, and the hero's son lets out a high pitched scream at 600 Hz, what pitch does the hero hear?

A pitch lower than 600 Hz

The villain in a movie grabs the hero's son and jumps onto a speeding train. If the train is moving away from the hero, and the hero's son lets out a high pitched scream at 600 Hz, What pitch does the villain hear?

A pitch of exactly 600 Hz

Which color of the rainbow corresponds to the hottest temperature?

Purple

A star much cooler than the sun would appear

Red

A galaxy is observed with a telescope on earth and is found to have a large redshift (that is, the light from this particular galaxy appears much redder to us than the light that is actually being emitted by the galaxy). What can we determine about this galaxy from this information?

The galaxy contains stars that are moving away from us very quickly

Which color of the rainbow has the longest wavelength?

red

Compared with ultraviolet radiation, infrared radiation has a greater:

wavelength

Compared with red light, blue light travels

At the same speed

The form of electromagnetic radiation with the highest energy is:

Gamma rays

Human beings "glow in the dark," but it is not a glow that we can see with our eyes. This is because:

The type of light we are giving off is infrared light, which isn't detectable by our eyes