NEET Class neet Answered
X-rays of a particular wavelength are used to irradiate sodium and copper surfaces in two separate experiments and stopping potentials are determined. The stopping potentials are
(1) Equal in both cases
(2) Greater for sodium
(3) Greater for copper
(4) Infinite in both cases
Asked by kumarisakshi0209 | 18 Mar, 2019, 09:48: AM
Expert Answer
The stopping potential is more for sodium than for copper. According to the photoelectric equation eVo=hν−work function
As the frequency of x-ray is same in both the cases. The work function of Na is 2.28 eV while for Cu it is 4.7 eV. It means the work function of sodium is less than the work function of copper. therefore the stopping potential of Na is greater than the stopping potential of copper.
As the frequency of x-ray is same in both the cases. The work function of Na is 2.28 eV while for Cu it is 4.7 eV. It means the work function of sodium is less than the work function of copper. therefore the stopping potential of Na is greater than the stopping potential of copper.
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