What is the exosphere?
A) the lowest layer in the atmosphere
B) the part of the atmosphere that absorbs optical light
C) the part of the atmosphere that absorbs ultraviolet
D) the part of the atmosphere that absorbs X-rays
E) the highest layer in the atmosphere
E
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Which of the following celestial bodies has the greatest influence on Earth's tides?
A. Moon B. Sun C. Venus D. Jupiter
Thin Lenses: Is it possible to see a virtual image?
A. No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image. B. No, since virtual images do not really exist. C. Yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object. D. Yes, but only by using an additional lens to form a real image before the light reaches the eye.
When the Sun is located near one of the horizons, an observer looking at the sky directly overhead will view partially polarized light. This effect is due to which of the following processes?
a. double refraction c. selective absorption b. optical activity d. reflection
The hottest (O and B type) stars are usually binary stars, while the coolest (M type) stars are usually single stars.
Answer the following statement true (T) or false (F)