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AP EAMCET20226 Jul 2022Morning ShiftPhysicsDual Nature of MatterActual

A radiation of 3.8 eV falls on a metal surface to produce photo electrons. These electrons are made to enter a magnetic field of 2 10⁻⁴ ~T . If the radius of the largest circular path followed by these electrons is 30 ~mm , then work function of the metal is (Mass of electron m _ e =9 10⁻³¹ ~kg )

Options

  1. A0.9 eV
  2. B1.0 eV
  3. C0.6 eV
  4. D1.2 eV

Correct answer

C. 0.6 eV

Step-by-step solution

aligned & K . E= q^2 B^2 r^2 2 ~m & K . E= (1.6 10⁻¹⁹ 2 10⁻⁴ 30 10⁻³ )^2 2 9 10⁻³¹ = & 5.06 10⁻¹⁹ ~J =3.16 LeV & So, work function =3.8-3.16 & 0.6 eV aligned

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