If the wave length of photon is doubled _____?

اگر فوٹوون کی لہر کی لمبائی دوگنی ______ ہے؟

Energy is doubled

Frequency is doubled

Energy is reduced by the factor of two

None of these

Energy of a photon is given by $E = frac{hc}{lambda}$ , so if the wavelength ( $lambda$ ) is doubled, energy ( $E$ ) is halved.

Frequency ( $f$ ) and wavelength ( $lambda$ ) are inversely related ( $c = flambda$ ), so doubling $lambda$ reduces $f$ by half.