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JIPMER2013PhysicsDual Nature of Matter

The work function for metals A, B and C are respectively 1.92 eV , 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photo, electrons for a radiation of wavelength 4100 Å is/are

Options

  1. Anone
  2. BA only
  3. CA and B only
  4. DAll the three metals

Correct answer

C. A and B only

Step-by-step solution

Work function for wavelength of 4100 Å is aligned W & = h c & = 6.63 10⁻³⁴ 3 10^8 4100 10⁻¹⁰ & =4.8 10⁻¹⁹ ~J & = 4.8 10⁻¹⁹ 1.6 10⁻¹⁹ eV & =3 eV aligned Now, we have aligned & W_A=1.22 eV & W_B=2.0 eV & W_C=5 eV aligned Since, W_A W and W_B W , hence A and B will emit photoelectrons.

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