Correct Answer - Option 1 : 399
Concept:
According to planck’s quantum theory of radiation, the energy of light is equivalent to energy of packets where each packet is known as Photon.
The energy of n moles of photon is given by
E = nNahν;
1 mole of photons = Na = 6.023 × 1023 photons;
Calculation:
Given ν = 1015 s-1, n = 1;
⇒ E = 1 × 6.023 × 1023 × 6.626 × 10-34 × 1015 = 399 kJ;
⇒ E = 399 kJ;