Nitrogen laser produces a radiation at a wavelength of 337.1 nm. If the number of photons emitted is `5.6 xx 10^(24)` per second, calculate the power of this laser.

Life of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source is '2.5 xx 10^(15)', calculate the energy of the source.

A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb

The number of photons emitted per second by a 60W source of monochromatic light of wavelength 663nm is

A 150 W hollow-cathode lamp of an atomic absorption spectrophotometer emits monochromatic light of wavelength 553.5 nm. Calculate the number of photons emitted in one minute (150 watts 150 Js^(-1) ).

Calculate the energy of 1 mole of photons whose frequency is 6.0xx10^(14) Hz.