A photon of blue light and a photon of red light are traveling in vacuum. The photon of blue light
A) has a smaller wavelength than a photon of red light and travels with the same speed.
B) has a smaller wavelength than a photon of red light and travels with a greater speed.
C) has a longer wavelength than a photon of red light and travels with the same speed.
D) has a longer wavelength than a photon of red light and travels with a greater speed.
A
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Collisions between galaxies:
A) are much rarer than collisions between stars. B) can turn elliptical galaxies into spirals. C) cause large numbers of stars to collide and explode. D) cause the gas and dust clouds to collide, leading to rapid star formation. E) are the best explanation for gamma-ray burst events.
An interstellar gas cloud has the mass to form hundreds of stars. What generally happens to it?
What will be an ideal response?
Suppose that Al the physicist observes a single radioactive nucleus. The length of time until that particular nucleus decays is
A) unpredictable because of the practical difficulties of obtaining all the information needed to make the prediction. B) unpredictable because of fundamental uncertainties arising from quantum physics C) predictable from the known half-life of the nucleus. D) unpredictable because of fundamental uncertainties arising from Newtonian physics. E) predictable, provided Al knows the precise nuclear state of this nucleus.
You discover a binary star system in which one member is a 15 solar mass main-sequence star and the other star is a 10 solar mass giant star. Why should you be surprised, at least at first?
A) The two stars should be the same age, so the more massive one should have become a giant first. B) The two stars in a binary system should both be at the same point in stellar evolution; that is, they should either both be main-sequence stars or both be giants. C) It doesn't make sense to find a giant in a binary star system. D) A star with a mass of 15 solar masses is too big to be a main-sequence star. E) The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable.