Class 12 NEET Physics Dual Nature of Matter and Radiation

Here work function,ϕ0=0.5eV
According to Einstein’s photoelectric equation
Maximum kinetic =    Incident - Work function
energy of the emitted  photon
electrons        energy
∴Kmax1=1eV−0.5eV=0.5eV......(i)
and Kmax2=2.5eV−0.5eV=2eV.....(ii)
Divide (i) by (ii), we get

Kmax1

Kmax2

=

0.5eV

2eV

=

1

4

1 2 mvmax12

1 2 mvmax22

=

1

4

or

vmax1

vmax2

=√

1

4

=

1

2