Question

The illustration shows the spectrum of electromagnetic radiation emitted by a blackbody at two different Kelvin temperatures. The range of visible frequencies (those that can be detected by the human eye) is also shown.(a) No matter what the value of the Kelvin temperature T, the spectrum decreases to zero at very high frequencies. Why is this?(i) At very high frequencies the photon energy is very small compared to kT.(ii) At very high frequencies the photon energy is very large compared to kT.(ii) At very high frequencies there are very few standing wave patterns in a blackbody cavity.(iv) Both (i) and (iii) are true.(v) Both (ii) and (iii) are true.

*k Range of visible frequencies 11 Violet t Red 11 IL Blackbody spectrum for higher temperature Intensity per frequency interval Il Blackbody || spectrum for || lower temperature Frequencyf 0

Answer 1

No matter what the value of the Kelvin temperature T, the spectrum decreases to zero at very high frequencies.

Beacause

At very high frequencies the photon energy is very large compared to kT

Option ( ii )