#### An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V the Value of n is.  Option 1) 3 Option 2) 4 Option 3) 5 Option 4) 2

As we learnt in

Lymen series -

- wherein

When electron jump from higher orbital to 1st energy level

i.e. ground state

Energy of photon emitted from the hydrogen atom is

This is equal to energy gap between n=1 and n=4 in hydrogen atom.

Option 1)

3

Incorrect

Option 2)

4

Correct

Option 3)

5

Incorrect

Option 4)

2

Incorrect