Light of wavelength 5000Å falls on a metal surface of work function 1.9eV. Find (i) the energy of photons in eV (ii) the kinetic energy of photoelectrons and (iii) the stopping potential. Use `h=6.63xx10^(-34)Js`,
`c=3xx10^8ms^-1 , e=1.6xx10^-9C.`

Explanation

To solve the problem step by step, we will follow the outlined tasks:

### Given Data:
- Wavelength of light, \( \lambda = 5000 \, \text{Å} = 5000 \times 10^{-10} \, \text{m} \)
- Work function of the metal, \( \phi = 1.9 \, \text{eV} \)
- Planck's constant, \( h = 6.63 \times 10^{-34} \, \text{Js} \)
- Speed of light, \( c = 3 \times 10^8 \, \text{m/s} \)
- Charge of electron, \( e = 1.6 \times 10^{-19} \, \text{C} \)
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