- The energy of a photon of wavelength 10-10 m is (h = 6.626 x 10-34 Js, c = 3 x 108 ms-1) (A) 6.626 x 10-20 J (B) 6.626 x 10-16 J (C) 6.626 x 10-12 J (D) 6.626 x 10-10 J (JEE Mains 2015)
The answer is (A).
The energy of a photon is given by E = hc/λ, where h is the Planck’s constant, c is the speed of light, and λ is the wavelength of the photon. In this case, h = 6.626 x 10-34 Js, c = 3 x 108 ms-1, and λ = 10-10 m. Substituting these values into the equation, we get E = 6.626 x 10-34
