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Cathode Ray Experiment

light of wave...

Question

light of wavelength 3310 A^° falls on a photocathode and an electron of energy 3×10^{-19}J is ejected if the wavelength of photon is changed to 5000A^° the electron energy is 7.91× 10^{-20}J calculate the plancks cons†an t and threshhold wavegth of photon

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Q. Initially a photon of wavelength

λ_{1}

falls on photocathode and emits an electron of maximum energy

E_{1}

. If the wavelength of the incident photon is changed to

λ_{2}

, the maximum energy of the electron emitted becomes

E_{2}

. Then value of hc (h = Planck's constant, c = Velocity of light) is :

Q. The minimum energy required by an electron to overcome the attractive forces of the nucleus is

0.6 \times 10^{- 19} J

. What is the maximum kinetic energy of the ejected electron if the material is radiated with a light of wavelength

2210 nm

?

Q. Calculate the approximates energy of a photon given that wavelength of photon is 2 nm and Planck constant

h

6.6 \times 10^{- 34} J s

.

Q. In a photoelectric effect, the energy of the photon striking a metallic surface is

5.6 \times 10^{- 19} J

. The kinetic energy of the ejected electrons is

12.0 \times 10^{- 20} J

. The work function is:

Q. Calculate the energy of photons having wavelength,

5 \times 10^{- 7} m

falls on a metal surface of work function,

3.4 \times 10^{- 19} J

:

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