MHT CET Medical202621 April 2026Evening ShiftChemistryStructure of AtomActual
Calculate the wavelength, wavenumber of photon having its energy 8.0 10⁻¹⁹ J . [h = 6.626 10⁻³⁴ J s , C = 3.0 10^8 m s ⁻¹]
Options
- A= 2.485 10⁻⁷ m and = 4.024 10^6 m ⁻¹ .
- B= 4.810 10⁻⁷ m and = 8.048 10^6 m ⁻¹ .
- C= 7.217 10⁻⁷ m and = 7.912 10^6 m ⁻¹ .
- D= 9.616 10⁻⁷ m and = 2.012 10^6 m ⁻¹ .
Correct answer
A. = 2.485 10⁻⁷ m and = 4.024 10^6 m ⁻¹ .
Step-by-step solution
The energy of a photon is given by E = hc = hc E Substituting the given values: = 6.626 10⁻³⁴ 3.0 10^8 8.0 10⁻¹⁹ = 19.878 10⁻²⁶ 8.0 10⁻¹⁹ = 2.48475 10⁻⁷ m 2.485 10⁻⁷ m Wavenumber is the reciprocal of wavelength: = 1 = 1 2.48475 10⁻⁷ = 4.0245 10^6 m ⁻¹ 4.024 10^6 m ⁻¹ Answer: = 2.485 10⁻⁷ m and = 4.024 10^6 m ⁻¹ .