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The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einsteins equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are (a) None (b) A only (c) A and B only (d) All three metals



The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einsteins equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are


        (a)    None


        (b)    A only


        (c)    A and B only      


(d)    All three metals


Grade:upto college level

2 Answers

Simran Bhatia
348 Points
9 years ago

 

So, only metals having work function less than 3eV can emit photoelectrons for the incident radiation of wavelength 4100 Å.

Rishi Sharma
askIITians Faculty 646 Points
2 years ago
Dear Student,
Please find below the solution to your problem.

Energy of electron with an associated wavelength of 4100A∘ is:
⇒ hc/λ ​ =4.845×10^−19J
=3.024eV
This incident electron would emit photon from metals whose work potential is less than its energy.
Thus, it would emit photons from metals A and B

Thanks and Regards

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