MHT CET202123 Sep 2021Morning ShiftPhysicsDual Nature of MatterActual
A photon has wavelength 3 ~nm , then its momentum and energy respectively will be [ h =6.63 10⁻³⁴ Js , c = velocity of light =3 10^8 ~m / s ]
Options
- A2.21 10⁻⁴³ ~kg ~ms ⁻¹ ; 6.63 10⁻³⁴ ~J
- B2.21 10⁻³⁴ ~kg ~ms ⁻¹ ; 6.63 10⁻²⁵ ~J
- C2.21 10⁻²⁵ ~kg ~ms ⁻¹ ; 6.63 10⁻¹⁷ ~J
- D2.21 10⁻¹⁶ ~kg ~ms ⁻¹ ; 6.63 10⁻¹⁹ ~J
Correct answer
C. 2.21 10⁻²⁵ ~kg ~ms ⁻¹ ; 6.63 10⁻¹⁷ ~J
Step-by-step solution
Momentum, p = h = 6.63 10⁻³⁴ 3 10⁻⁹ =2.21 10⁻²⁵ ~kg ~ms ⁻¹ Energy, E = hc = pc =2.21 10⁻²⁵ 3 10^8=6.63 10⁻¹⁷ ~J