is given in Fig. 7(EP).4 (i)
Which material A or 5 has a higher work function? (ii) Given the electric
charge of an electron = 1.6 x 10-19 C, find the value of h obtained
from the experiment for both A and B. Comment on whether it is consistent with
Einstein's theory.
Answer:
(i) Here, threshold
frequency of A, 
HZ and of 
.
Work function, 
Therefore, work
function is higher for material B than A
(ii) For metal A,
slope 
Or 
For metal B, slope =
Or 
Since, the value of h from experiment for metals A and B is
different. Hence, experiment is not consistent with theory.
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