Question

photoelectric emission is observed from surface for frequencies V1 and V2 the kinetic energy in two cases are in the ratio 1 :M then the threshold frequency Vo(vnot) is given by

Answer 1

Hv1=hv0+k.e1 (1)

HV2=hv0+k.e2 (2)
K.e1/k.e2=1/M (M k.e1=k.e2)

2÷1
Hv2-hv0/hv1-hv0=M
V2-v0=M(v1-v0)
V2-v0=Mv1-Mv0
V2-Mv1=v0(1-M)
V0 =v2-xv1/1-x