In one popular type of fusion reaction, 2H fuses with 3H to yield 4He and
A) a neutron.
B) a beta particle.
C) an alpha particle.
D) a proton.
E) Actually no other particle is produced.
A
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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.
An elephant radiates less heat for its size than smaller animals because
A) its radiating area is small compared to its volume. B) its radiating area is large compared to its volume. C) it is taller than smaller animals. D) it weighs more than smaller animals.
The angular magnification of a magnifying glass is largest when the image is at
A) the near point of the eye. B) the far point of the eye. C) infinity. D) the focal point of the lens. E) The magnification depends on the magnifying glass lens, not where the person puts his eye.
A 10-meter-long spear is thrown at relativistic speeds through a 10-meter-long pipe. (Both these dimensions are measured when each is at rest.) When the spear passes through the pipe
A) the spear appears to shrink so the pipe completely covers it. B) the pipe appears to shrink so the spear extends from both ends. C) both appear to shrink equally so the pipe barely covers the spear. D) any of these, depending on the motion of the observer (moving with the spear, at rest with the pipe, and so on). E) none of the above