A person stands between two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other
What type of interference does the person perceive?
A) constructive B) destructive
C) both constructive and destructive D) neither constructive nor destructive
A
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The most detailed look we've had of an asteroid comes from
A) spacecraft sent to an asteroid. B) ground-based radar images. C) Earth orbital X-ray images. D) ground-based optical images. E) high-altitude UV spectroscopy.
COBE found the cosmic microwave background to be absolutely uniform everywhere
Indicate whether the statement is true or false
The secondary rainbow is dimmer than the primary rainbow because
A) its colors are inverted. B) it is larger, and its energy spreads across more area. C) it is farther from the viewer. D) it simply has much less energy than the primary bow. E) of a double reflection and refraction in the drops.
A photon whose energy is 8.00 × 10^-15 J is scattered off an electron at a 90° angle. What is the wavelength of the scattered wave?
a. 2.73 × 10^-11 m b. 2.25 × 10^-11 m c. 2.50 × 10^-11 m d. 2.40 × 10^-12 m e. 2.48 × 10^-11 m