When a metal ring with a gap in the shape of the letter C is heated, the gap becomes
A) wider.
B) narrower.
C) remains the same size.
Answer: A
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A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 1000 m from the source is (in dB)
A. 62.8. B. 66.0. C. 68.5. D. 70.5. E. 72.0.
Suppose that you wish to construct a simple ac generator having an output of 12 V maximum when rotated at 60 Hz. A uniform magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns do you need?
A) 8 B) 16 C) 32 D) 64 E) 128
The galactic center lies in the direction of which constellation?
A) Orion B) the Big Dipper C) Leo D) Sagittarius E) Taurus
A single thin slit forms a diffraction pattern when illuminated with monochromatic light. The fourth minimum of the pattern occurs at an angle of 32.0° away from the central maximum. At what angle does the fifth minimum occur?
A) 41.5° B) 41.0° C) 40.5° D) 42.0° E) 42.5°