Q4 of 69 Page 364

If the wavelength of light in an experiment on photoelectric effect is doubled.

if wavelength of the light is doubled then the photons emitted energy becomes half.

Energy of photon = hv =


where h is plank’s constant and ν is the frequency which is where the c is the speed of light and{displaystyle lambda }
{displaystyle lambda } λ (Lambda) is wavelength.


∴ the stopping potential is the potential which is required to stop the max kinetic energy electron. if the energy of photon is decreased


the stopping potential also decreases.

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