Question

The maximum wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be(a) 12.4 eV(b) 6.2 eV(c) 100 eV(d) 200 eV

Answer 1

Answer: (b). The maximum kinetic energy acquired by electron due to radiation is 6.2 eV.

Explanation:

Given that,

Wave length $\lambda _{1} = 200\ nm$

Wave length $\lambda _{2} = 100\ nm$

We know that,

The kinetic energy of photon is

$K.E = hc[\dfrac{1}{\lambda_{2}}-\dfrac{1}{\lambda_{1}}]$

$K.E = 4.136\times10^{-15}\times 3\times 10^{8}[\dfrac{1}{100\times10^{-9}}-\dfrac{1}{200\times10^{-9}}]$

$K.E = 6.2 eV$

Hence, The maximum kinetic energy acquired by electron due to radiation is 6.2 eV.

Answer 2

Mark me as brainliest answer pls