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
(a) will remain unchanged
(b) will be doubled
(c) will be halved
(d) will become four times the original

Question

Toppr Admin · Accepted Answer

The cut off wavelength corresponds to the work function of the material-W-hc-x3BB-x2218-where -x3BB-x2218- is the cutoff wavelength- Work function is independent of the electric field applied externally to the material- therefore the cut off wavelength will remain unchanged-

If the potential difference applied to the photoelectric tube is doubled and the separation between the filament and the target is also doubled, then the cut off wavelength:
will remain uncharged.
will be doubled.
will be halved.
will become four times the original.

The cut off wavelength corresponds to the work function of the material:
$W = \frac{h c}{λ_{\circ}}$
where $λ_{\circ}$ is the cutoff wavelength. Work function is independent of the electric field applied externally to the material, therefore the cut off wavelength will remain unchanged.

If the potential difference applied to the photoelectric tube is doubled and the separation between the filament and the target is also doubled, then the cut off wavelength:will remain uncharged.will be doubled.will be halved.will become four times the original.

The cut off wavelength corresponds to the work function of the material:W=hcλ∘where λ∘ is the cutoff wavelength. Work function is independent of the electric field applied externally to the material, therefore the cut off wavelength will remain unchanged.

If the potential difference applied to the photoelectric tube is doubled and the separation between the filament and the target is also doubled, then the cut off wavelength:
will remain uncharged.
will be doubled.
will be halved.
will become four times the original.

The cut off wavelength corresponds to the work function of the material:
$W = \frac{h c}{λ_{\circ}}$
where $λ_{\circ}$ is the cutoff wavelength. Work function is independent of the electric field applied externally to the material, therefore the cut off wavelength will remain unchanged.