Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
Share

# If the Potential Difference Applied to the Tube is Doubled and the Separation Between the Filament and the Target is Also Doubled, the Cutoff Wavelength - Physics

ConceptElectromagnetic Spectrum

#### Question

If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength

• will remain unchanged

• will be doubled

• will be halved

• will become four times the original

#### Solution

will be halved

Cut off wavelength is given by lambda_min = (hc)/(eV),

where = Planck's constant
c = speed of light
= charge on an electron
V = potential difference applied to the tube
When potential difference (V) applied to the tube is doubled, cutoff wavelength (lambda'_min) is given by

lambda'_min = (hc)/(e(2V)

⇒ lambda'_min = lambda_min/2

Cuttoff wavelength does not depend on the separation between the filament and the target.
Thus, cutoff wavelength will be halved if the the potential difference applied to the tube is doubled.

Is there an error in this question or solution?

#### Video TutorialsVIEW ALL [2]

Solution If the Potential Difference Applied to the Tube is Doubled and the Separation Between the Filament and the Target is Also Doubled, the Cutoff Wavelength Concept: Electromagnetic Spectrum.
S