question_answer

Maximum kinetic energy \[{{E}_{k}}\] of a photoelectron varies with the frequency \[v\] of the incident radiation as:

A)

B)

C)  

D)

Correct Answer: A

Solution :

From Einstein's theory, the maximum kinetic energy \[({{E}_{k}})\] of emitted photoelectron is                 \[{{E}_{k}}=hv-W\]                                          ... (i) where, \[v\] is frequency and \[W\] is work function. Also equation of straight line, with slope \[m\], and intercept \[c\] on \[x-\]axis given by                 \[y=mx+c\]                                         ... (i) Comparing Eqs. (i) and (ii), we get