A filter transmits only radiation of wavelength greater than 440 nm. Radiation from a hydrogen discharge tube goes through such a filter and it’s incident on a metal of work function 1.8 eV. Find the stopping potential (in V) which can stop the photoelectrons. (Answer upto 2 decimal places)

Open in App

Solution

Energy of a photon
$E = K E_{m a x} + ϕ_{0}$
$K E_{m a x} = E - ϕ_{c}$
For a photon
$λ_{m i n} = \frac{1242 eV.nm}{Δ E (eV)}$
$= \frac{1242}{2.55}$
$= 487 nm$
$K E_{m a x} = e V_{s}$
$e V_{s} = [2.55 - 1.8] eV$
$V_{s} = 0.75 V$

Suggest Corrections

Similar questions

Q. A filter transmits only the radiation of wavelength greater than 440 nm. Radiation from a hydrogen-discharge tube goes through such a filter and is incident on a metal of work function 2.0 eV. Find the stopping potential which can stop the photoelectrons.

A filter transmits only the radition of wavelength greater than 440 nm. Radition from a hydrogen discharge tube goes through such a filter and is incident on a metal of work function 2.0 e V. Find the stopping potential which can stop the photoelectrons.

Q. A filter transmits only the radiation of wavelength