In a photoelectric experiment, kinetic energy of photoelectron is 18.210 power -19 J. The wavelength of incident light (approx) , if work function of metal is 1 eV, is (planck's constant = 6.610 power -34 J s and 1 eV = 1.610 power -19 J

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Q. The work function of a metal is

2 e V

. If a radiation of wavelength

3000

˚ A

is incident on it, the maximum kinetic energy of the emitted photoelectrons is :
(Planck's constant

h = 6.6 \times 10^{- 34} J s

; Velocity of light

c = 3 \times 10^{8} m / s; 1 e V = 1.6 \times 10^{- 19} J

)

Q. The work function of a metal is

5 e V

. What is the kinetic energy of the photoelectron ejected from the metal surface if the energy of the incident radiation is

6.2 e V

[e V = 1.6 \times 10^{- 19}]

Q. The work function of a metal is

3.5 \times 10^{- 19} e V

. If

5000 A

wavelength of light is incident on the metal, is there would be any photoelectric effect?

In the photoelectric experiment, if we use a monochromatic light, the photoelectric current vs voltage curve is as shown. If work function of the metal is $2 e V$ , the power of light used in Watt is . (Assume number of photoelectrons emitted are $10^{- 3} %$ of number of photons incident on metal)

Q. In a photoelectric effect experiment, the maximum kinetic energy of the ejected photoelectrons is measured for various wavelengths of the incident light. Figure shows a graph of this maximum kinetic energy

K_{m a x}

as a function of the wavelength

λ

of the light falling on the surface of the metal. Which of the following statements is/are correct?

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Energy of a Capacitor

Standard XII Physics