Niels Bohr focused his attention on the element hydrogen because it
a. could be obtained in extremely high purity.
b. was so abundant.
c. had the simplest atom.
d. was inexpensive.
c
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Wave Characteristics: A radio station broadcasts at 80 MHz. How long does it take for this radio signal to travel a distance of 2.0 × 107 m through space? (c = 3.0 × 108 m/s)
A. 0.15 × 10-2 s B. 15 ms C. 6.7 × 10-2 s D. 20 ms E. 25 ms
If an electric toaster rated at 110 V is accidently plugged into a 220-V outlet, the current drawn by the toaster will be
A) half its normal value. B) the same as its normal value. C) twice its normal value. D) none of the above
Whenever a gas is compressed,
A. heat must leave the gas. B. the temperature of the gas must get smaller. C. its internal energy must get smaller. D. work must be done on the gas.
The fraction of incident light that a body reflects is known as its
a. Rayleigh scattering. b. insolation. c. albedo. d. humidity.