Why is the light from near a black hole redshifted?
What will be an ideal response?
The gravity is great enough to decrease the energy of the escaping photons and thus increase their observed wavelength.
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Humans cannot survive on the surface of Mars for long periods of time because
a. there is not enough oxygen in the atmosphere. b. the range in temperature between day and night is too large. c. the flux of UV radiation reaching the surface is too high. d. the atmospheric pressure would be too low. e. all of the above
The early atmosphere of Earth had much less oxygen than today. How has Earth's oxygen abundance increased over Earth's history?
A. Ultraviolet light breaks up ozone into oxygen. B. Volcanic eruptions release large amounts of oxygen. C. Cometary impacts over Earth's history have contributed oxygen to the atmosphere. D. Plant life generated oxygen through photosynthesis. E. None of these choices are correct.
Two 100 W lightbulbs are to be connected to a 120 V source. What is the current, potential difference, and dissipated power for each when they are connected:
(a) in parallel (the normal arrangement)? (b) in series?
The two most common types of poor eyesight are the result of improper ______________
Fill in the blank(s) with correct word