Which of the following actions will increase the energy of a photon? (There could be more than one correct choice.)
A) Increase its wavelength.
B) Increase its frequency.
C) Decrease its wavelength.
D) Decrease its frequency.
E) Increase its speed.
B, C
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Traveling at their current speeds, how long would it take the Pioneer and Voyager probes to travel the distance to the nearest stars?
A) at least 100,000 years B) several billion years C) around 4.4 years D) about a 1,000 years
State Newton's second law of motion in terms of momentum
What will be an ideal response?
If a star exhibits no Doppler shift in its emitted light, it must be true that ________.
A. the star is neither moving toward nor away from Earth B. the star is not moving relative to Earth C. the star does not emit much visible light D. the star only displays proper motion
Susan Solomon led the scientific expedition that
A) measured the rate of temperature increase at isolated places on earth, such as the north pole and the Gobi desert. B) studied the problem of ozone depletion over Antarctica. C) measured the carbon-dioxide content of the atmosphere at many places on Earth. D) measured the ozone content of the upper atmosphere at many places above the surface of the earth. E) studied in detail the atmospheric effects (especially carbon-dioxide injections) of large active volcanoes.