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If the Current in the Circuit for Heating the Filament is Increased, the Cutoff Wavelength - Physics

MCQ

If the current in the circuit for heating the filament is increased, the cutoff wavelength

Options

  • will increase

  • will decrease

  • will remain unchanged

  • will change

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Solution

will remain unchanged
Cut off wavelength is given by `lambda_min = (hc)/(eV)`,

where h = Planck's constant
            c = speed of light
            e = charge on an electron
            V = potential difference applied to the tube
Clearly, the cutoff wavelength does not depend on the current in the circuit and temperature of the filament.

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APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 22 X-rays
MCQ | Q 5 | Page 394
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