Question

The infrared ray that is propagated through the TV remote has a wavelength of 1.3pm. How do i calculate the energy of a photon of the infrared ray with this wavelenth? Thanks

Answer 1

The energy is `=15.4*10^-14J`

Explanation:

The wavelength is `lambda=1.3 p m=1.3*10^-12m`

The speed of light is `c=3*10^8ms^-1`

The frequaecy is

`nu=c/lambda=(3*10^8)/(1.3*10^-12)=2.31*10^20Hz`

Planck Constant is `h=6.67*10^-34Js`

The energy of `1` photon is

`E=hnu=6.67*10^-34xx2.31*10^20 J`

`=15.4*10^-14J`