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Angular Position of Fringes in Diffraction

Two separate ...

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Two separate monochromatic light beams A and B of the same intensity are falling normally on a unit area of metallic surface their wavelength Lambda A and Lambda B respectively assuming that all the incident light is used in ejecting the photoelectrons the ratio of number of photoelectrons from the beiam A to that from beam B is.

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Q. Two separate monochromatic light beams

A

B

of the same intensity are falling normally on a unit area of a metallic surface. Their wavelengths are

λ_{A}

λ_{B}

, respectively. Assuming that all the incident light is used in ejecting the photoelectrons, the ratio of the number of photoelectrons from beam

A

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Q. Two separate monochromatic light beams

A

B

of the same intensity (energy per unit area per unit time) are falling normally on a unit area of a metallic surface. Their wavelength is

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Q. A beam of light has three wavelengths

4144 \circ A, 4972 \circ A

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with a total intensity of

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1.0 c m^{2}

of a clean metallic surface of work function

2.3 e V

. Assume that there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate the number of photoelectrons liberated in two seconds.

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4144 \circ A, 4972 \circ A

6216 \circ A

with a total intensity of

3.6 \times 10^{- 3} W m^{2}

equally distributed amongst the three wavelengths. The beam falls normally on the area

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Q. A small metal plate (work function φ) is kept at a distance d from a singly-ionised, fixed ion. A monochromatic light beam is incident on the metal plate and photoelectrons are emitted. Find the maximum wavelength of the light beam, so that some of the photoelectrons may go round the ion along a circle.

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