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

Physics & Space Science

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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.

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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.

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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

Physics & Space Science

As sediment travels in a downstream river, it changes by getting

A) coarser. B) finer. C) more poorly sorted. D) more angular.

Physics & Space Science