Radiation, with wavelength $$6561$$ $$A0$$ falls on a metal surface to produce photoelectrons . The electrons are made to enter a uniform magnetic field of $$3$$×$$10$$−$$4T$$ . If the radius of the largest circular path followed by the electrons is $$10$$ mm, the work function of the metal close to:

Question

Radiation, with wavelength $$6561$$  $$A0$$ falls on a metal surface to produce photoelectrons . The electrons are made to enter a uniform magnetic field of  $$3$$×$$10$$−$$4T$$ . If  the radius of the largest circular path followed by the electrons is $$10$$ mm, the work function  of the metal close to:

Infinity Learn · Accepted Answer

Incident Energy, $$Ei=12400$$λin $$A0=124006561=1.89$$  eV    Radius of Circle, $$r=mvBe=2mKBe$$⇒ $$K=r2B2e22m=10$$×$$10$$−$$32$$×$$3$$×$$10$$−$$42$$×$$1.6$$×$$10$$−$$1922$$×$$9.1$$×$$10$$−$$31J$$×$$1$$ $$eV1.6$$×$$10$$−$$19J=0.79eV$$∴Work function $$=Ei$$−$$K=1.1$$  eV

Radiation, with wavelength 6561 $A^{0}$ falls on a metal surface to produce photoelectrons . The electrons are made to enter a uniform magnetic field of $3 \times 10^{- 4} T$ . If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal close to:

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Radiation, with wavelength 6561 A0 falls on a metal surface to produce photoelectrons . The electrons are made to enter a uniform magnetic field of 3×10−4T . If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal close to:

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Radiation, with wavelength 6561 $A^{0}$ falls on a metal surface to produce photoelectrons . The electrons are made to enter a uniform magnetic field of $3 \times 10^{- 4} T$ . If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal close to: