orx Proton mass is i meta metal function for a particular the Note, photoelectri

Question

orx Proton mass is i meta metal function for a particular the Note, photoelectric experiment to determine the work of o.376 V the o points) Two light sources are used in a nm is potential of 13 V reduces surface. When green light from a lamp used, a stopping potential to a violet light from a hydrogen discharge tube is tube? photocurrent to zero, what is the wavelength of the violet light used from a hydrogen discharge pattern A ham of red light from the hydrogen lamp of wavelength 656 nm is diffracted by a slit. The diffraction the slit Tho licond maximum is 1.50 mm. a) (5 points) What is

Explanation / Answer

Stopping potential is given by;

V0 = [(hc/) - ]/e, where is the work function.

or, eV0 = hc/ -

We have = 546.1nm, for V0 = 0.376 V, so we have

e(0.376 V) = (hc/) - ---- (1)

let the wavelength for the violet light be 0 , then

e(1.13 V) = (hc/0) - ------ (2),

from equations (1) and (2), we get;

e(1.13 V) - e(0.376 V) = hc/0 - hc/ = hc[1/0 - 1/]

or, e(0.754V) = hc[1/0 - 1/] ,

or, (1.6X10-19 C)(0.754V) = (6.63X10-34 J.s)(3X108 m/s)[1/0 - 1/(546.1X10-9 m)]

or, 0 = 410.22 nm is the wavelength of the violet light used;

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