Question

A yellow laser provides 210 kJ/mol of energy to excite electrons in a sample. What is the frequency of this light?

Answer 1

Frequency,
`f=5.24* 10^(14)\ Hz`

Step-by-step explanation:

It is given that, a yellow laser provides 210 kJ/mol of energy to excite electrons in a sample. We need to find the frequency of this light.

Energy, E = 210 kJ/mol

i.e.

`E=210\ (kJ)/(mol)\\\\E=210* 1000\ (J)/(mol)\\\\E=(21* 10^4\ J/mol)/(6.022* 10^(23)\ /mol)\\\\E=3.48* 10^(-19)\ J`

The energy used to excite electrons is given by :

`E=hf\\\\f=(E)/(h)\\\\f=(3.48* 10^(-19))/(6.63* 10^(-34))\\\\f=5.24* 10^(14)\ Hz`