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)
0.25.
B)
0.50.
C)
0.63.
D)
0.87.
E)
0.75.
B
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Energy and Momentum: In a police ballistics test, a 2.00-g bullet suddenly hits and becomes embedded in a 5.00-kg wood block which is hanging from a 1.20-m long string. This causes the block to swing through an arc of 3.50°. What was the speed of the bullet just before it hit the block?
A. 16.7 m/s B. 524 m/s C. 25.3 m/s D. 262 m/s E. 789 m/s
The making of abundant iron nuclei is typical of
A) planetary nebula ejection. B) the helium flash. C) all novae. D) type I supernovae. E) type II supernovae.
An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero
What is the magnitude of the orbital angular momentum L of the atom? A) 1.4? B) 2.0? C) 1.7? D) 1.0? E) 1.2?
If nitrogen, Image, were pumped into your lungs at high pressure, what would happen to its solubility in your blood stream?
A) The greater the pressure, the greater the solubility. B) The greater the pressure, the lower the solubility. C) You cannot change solubility of a substance by changing the pressure. D) Nitrogen is not soluble in your blood.