Human damage is usually highest for radiation by
A) beta particles.
B) alpha particles.
C) either of the above
D) none of the above
Answer: B
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Gravitational lensing
a. occurs when light passes near a massive object and is deflected by the object's gravitational field. b. can be used to determine the luminosity of a galaxy. c. occurs when the mass of a galaxy is greater than expected from the luminosity of the galaxy. d. occurs when the mass of a galaxy is less than expected from the luminosity of the galaxy. e. can be used to determine the recessional velocity of a galaxy.
A polarizer (with its preferred direction rotated 30° to the vertical) is placed in a beam of unpolarized light of intensity 1. After passing through the polarizer, the beam's intensity is
A) 0.2501. B) 0.7501. C) 0.5001. D) 0.8661. E) 0.5000.
At the peak of its motion, the acceleration of a projectile is zero
a. True b. False Indicate whether the statement is true or false
As sediment travels in a downstream river, it changes by getting
A) coarser. B) finer. C) more poorly sorted. D) more angular.