A photon of `300 nm` is absorbed by a gas which then re-emits photon .One re-emited photon has a wavelength of `400 nm` .Calculate the energy of the other photon re-emitted not

Explanation

To solve the problem, we need to calculate the energy of the other photon re-emitted by the gas after absorbing a photon of wavelength 300 nm and re-emitting one photon of wavelength 400 nm.

### Step-by-Step Solution:

1. **Calculate the energy of the absorbed photon (E_total)**:
The energy of a photon can be calculated using the formula:
\[
E = \frac{hc}{\lambda}
...