Question

(1) (A) If the power output of a 675 kHz radio station is 53.0 kW, how many photons per second are produced? If the radio waves are broadcast uniformly in all directions, find the number of photons per second per square meter at a distance of 130 km. Assume no reflection from the ground or absorption by the air.

(B)Photoelectrons from a material whose work function is 2.39 eV are ejected by 477 nm photons. Once ejected, how long does it take these electrons (in ns) to travel 2.55 cm to a detection device?

(C)A solid metal sphere emits 1.62 ✕ 10^{20} photons
every second with a radiating power of 2.73 W. Determine the energy
associated with each photon. now Assuming the sphere's power output
is associated with the peak wavelength, determine the temperature
of the sphere at which this wavelength is emitted.

Answer #1

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