Advertisements
Advertisements
Question
Photons of wavelength λ are incident on a metal. The most energetic electrons ejected from the metal are bent into a circular arc of radius R by a perpendicular magnetic field having magnitude B. The work function of the metal is
Options
`"hc"/λ - "m"_"e" + ("e"^2"B"^2"R"^2)/(2"m"_"e")`
`"hc"/λ + 2"m"_"e" ["eBR"/(2"m"_"e")]^2`
`"hc"/λ - "m"_"e""c"^2 - ("e"^2"B"^2"R"^2)/(2"m"_"e")`
`"hc"/λ - 2"m"_"e" ["eBR"/(2"m"_"e")]^2`
Advertisements
Solution
`"hc"/λ - 2"m"_"e" ["eBR"/(2"m"_"e")]^2`
APPEARS IN
RELATED QUESTIONS
In photoelectric emission, a radiation whose frequency is 4 times threshold frequency of a certain metal is incident on the metal. Then the maximum possible velocity of the emitted electron will be
What is the photoelectric effect?
How does photocurrent vary with the intensity of the incident light?
Give the definition of intensity of light according to quantum concept and its unit.
Explain how frequency of incident light varies with stopping potential.
Give the construction and working of photo emissive cell.
How many photons of frequency 1014 Hz will make up 19.86 J of energy?
When a light of frequency 9 × 1014 Hz is incident on a metal surface, photoelectrons are emitted with a maximum speed of 8 × 105 ms−1. Determine the threshold frequency of the surface.
A 3310 Å photon liberates an electron from a material with energy 3 × 10−19 J while another 5000 Å photon ejects an electron with energy 0.972 × 10−19 J from the same material. Determine the value of Planck’s constant and the threshold wavelength of the material.
At the given point of time, the earth receives energy from the sun at 4 cal cm–2 min–1. Determine the number of photons received on the surface of the Earth per cm2 per minute. (Given: Mean wavelength of sunlight = 5500 Å)
