The intensity of unpolarized light passing through a single sheet of polarizing material changes by a factor of:
a. 0.5.
c. cos2 q.
b. 1.
d. cos q.
A
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You are heating two chunks of metal of the same size and shape. One is made of lead and is heated to 400 K. The other is made of iron and is also heated to 400 K. Which of the following statements apply to the thermal radiation the two chunks emit?
A) The two spectra peak at the same wavelength. B) The spectra cannot be compared because they come from different materials. C) The lead spectrum peak is at a shorter wavelength than the iron spectrum peak. D) The lead spectrum peak is at a longer wavelength than the iron spectrum peak.
The ____ of the Moon and Sun vary slightly because the orbits of the Moon and Earth are slightly elliptical
a. angular distance b. linear diameter c. linear distance d. angular diameter e. angular momentum
The following images represent four types (wavelength bands) of light. Rank these from left to right based on the amount of each that is emitted (as thermal radiation) by Earth’s surface, from greatest to least. If you think that two (or more) types should be ranked as equal, drag one on top of the other(s) to show this equality.
Based on DNA studies, it seems that all life on Earth ________
A) arose from one of five distinct ancestors that lived about two billion years ago B) shares a common ancestor C) requires oxygen to survive D) belongs to one of just two kingdoms: plants and animals