Question

Calculate the energy of light having a wavelength of 395 nm. show work

Answer 1

Answer: $5.032\times 10^{-19}\ J$

Explanation:

Given

The wavelength of the light is $\lambda =395\ nm$

Energy associated with a photon(light) is given by $E=\frac{hc}{\lambda}$

where, $h=\text{Planck constant}$

$c=\text{speed of light}$

$\Rightarrow E=\dfrac{6.626\times 10^{-34}\times 3\times 10^8}{395\times 10^{-9}}\\\\\Rightarrow E=5.032\times 10^{-19}\ J$

Therefore, the energy associated with the light is $5.032\times 10^{-19}\ J$