# 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

#### 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.

Is there an error in this question or solution?

#### APPEARS IN

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