Two electromagnetic have different frequencies but equal amplitudes. The one with higher frequency has the
A) greater energy.
B) greater speed.
C) longer wavelength.
D) All of the above.
E) None of the above.
A
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When a hologram is illuminated with a beam of coherent light, it produces
A) both a real and a virtual image. B) only a real image of the object. C) only a virtual image of the object.
Large curved cooling towers can often be seen at
A) steam-electric power plants. B) nuclear power plants. C) Both of the above. D) hydro-electric plants. E) All of the above.
Which of these is considered true about the mass of the neutrino?
a. It is the same as the mass of an electron or positron. b. It is the same as the mass of a nucleon. c. It is the same as the mass of an alpha particle. d. It is zero. e. It is slightly more than zero, but less than an electron.
A baseball is hit almost straight up into the air with a speed of about 20 m s.
(a) How high does it go? (b) How long is it in the air?