Question

find the ernergy of radiation whose wave number is 4 × 10 ⁸ meter per second​

Answer 1

E = H*lambda(wavelength)

wavelength = number of metres per unit wave

wave number = number of waves per unit length

wavelength = 1/wave number

=> E = 6.62*10^-34/(4*10^8)

=> E = 1.655*10^-42