If a radio wave has speed 3.00 × 10^8 m/s and frequency 94.3 MHz, what is its wavelength?
a. 1.59 m
b. 2.14 m
c. 4.24 m
d. 3.18 m
e. 6.30 m
d
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Will a blackbody at temperature T emit more photons per second with energy kBT or with energy 6 kBT?
A. It will emit more photons with the lower energy. B. It will emit more photons with the higher energy. C. The number of photons emitted will be the same. D. One has no way of telling.
In what scenario is the blue component of incoming sunlight is scattered much more than any other color component?
A) when the Sun is setting B) when the Sun is high in the sky C) when the Sun is rising D) during the night time E) during a solar eclipse
A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced
If this battery supplies a current of 25 mA to the player, what is the cost of the energy provided by the battery in dollars per kWh? A) $11/kWh B) $11,000/kWh C) $1100/kWh D) $110/kWh
What is the frequency of monochromatic light where the photon energy is 6.5 × 10^-19 J? (h = 6.63 × 10^-34 J×s)
a. 2.2 × 10^14 Hz c. 4.4 × 10^14 Hz b. 9.8 × 10^14 Hz d. 8.3 × 10^14 Hz