Problem solving tips

## Dual Nature Of Radiation And Matter

- Want to score better marks in exams? Have a look at some problem solving tips.
1
Tip-1: Calculating the kinetic energy of photoelectrons
When light of suitable energy is incident on a metal surface, photoelectrons are emitted from the surface. many times we are asked to calculate the maximum kinetic energy of the photoelectrons.
Maximum Kinetic energy of photoelectrons = Energy of the incident light - Work function
2
Tip-2: Converting energy into the unit of electron-volt
We usy denote energy in the unit of joule. But in case of photoelectric emission or X-ray production, it is convenient to use energy in terms of electron-volt. We get energy in electron volt by dividing the energy in joule by the charge of electron. .uall
3
Tip-3: Determining hard X-rays and soft X-rays
Hard X-rays have high energy. One can easily determine the energy of X-ray by measuring its wavelength and vice-versa. The maximum possible energy of X-ray = Kinetic energy of electrons moving in a potential. Finally, .