Unpolarized light passes through three ideal polarizing filters
The first filter is oriented with a horizontal transmission axis, the second one has its transmission axis at 30° from the horizontal, and the third filter has a vertical transmission axis. What percent of the light gets through this combination? A) 9.4%
B) 91%
C) 50%
D) 0%
E) 33%
A
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Doppler Effect: You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind at constant speed and you perceive the frequency as 1310 Hz. You are relieved that he is in pursuit of a different driver when he continues past you, but now you perceive the frequency as 1240 Hz. What is the frequency of the siren in the police car? The speed of sound in air is 343 m/s.
A. 1300 Hz B. 1320 Hz C. 1270 Hz D. 1360 Hz E. 1370 Hz
In the atmosphere, the shortest wavelength electromagnetic waves are called
A. microwaves. B. infrared waves. C. ultraviolet waves. D. X-rays. E. gamma rays.
During a single period, the distance traveled by a wave is
A) one-half wavelength. B) one wavelength. C) two wavelengths. D) more information is needed
If you hold your fist at arm's length, you will see it spanning an angle of about
A) 1 arcsecond. B) 1°. C) 10°. D) 45°. E) 90°.