An ideal solenoid has a length of 25 mm. If the windings are compressed so that the length is reduced to 1?2 of its original length how does the inductance change?
A. 1?4 of original
B. to 1?2 of original
C. twice the original
D. quadruple the original
B. to 1?2 of original
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Photon Energy: An 84-kW AM radio station broadcasts at 1000 kHz. How many photons are emitted each second by the transmitting antenna? (h = 6.626 × 10-34 J ? s)
A. 1.3 × 1032 B. 2.9 × 1024 C. 6.3 × 1012 D. 1.4 × 1015
When atoms unite by transferring electrons, they should form
a. a polar molecule. b. a covalent compound. c. an ionic compound. d. an organic compound.
A river flows due east at 2.0 m/s. A boat crosses the 300-m-wide river by maintaining a constant velocity of 15 m/s due north relative to the water. If no correction is made for the current, how far downstream does the boat move by the time it reaches the far shore?
a. 80 m b. 30 m c. 25 m d. 40 m e. 50 m
Light spreads out when it passes through a narrow slit because of __________
Fill in the blank(s) with correct word