An alpha nucleus of energy 1 /2 mv2 bombards a heavy nuclear tar

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The time by a photoelectron to come out after the photon strikes is approximately

  • 10−1 s

  • 10−4 s

  • 10−10 s

  • 10−10 s

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12.

An alpha nucleus of energy 1 /2 mv2 bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to 

  • 1/Ze

  • v2

  • 1/m

  • 1/m


C.

1/m

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13.

If I0 is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled?

  • 2I0

  • 4I0

  • I0

  • I0

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14.

The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young’s double-slit experiment is

  • infinite

  • five

  • three

  • three

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15.

An electromagnetic wave of frequency ν = 3.0 MHz passes from vacuum into a dielectric medium with permittivity ε = 4.0. Then

  • wavelength is doubled and the frequency remains unchanged

  • wavelength is doubled and frequency becomes half

  • wavelength is halved and frequency remains unchanged

  • wavelength is halved and frequency remains unchanged

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16.

According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal Vs the frequency, of the incident radiation gives straight line whose slope

  • depends on the nature of the metal used

  • depends on the intensity of the radiation

  • depends both on the intensity of the radiation and the metal used

  • depends both on the intensity of the radiation and the metal used

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17.

The work function of a substance is 4.0 eV. Then longest wavelength of light that can cause photoelectron emission from this substance approximately

  • 540 nm

  • 400 nm

  • 310 nm,

  • 310 nm,

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18.

The angular width of the central maximum in a single slit diffraction pattern is 60°. The width of the slit is 1 μm. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young’s fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance?
(i.e. distance between the centres of each slit.)

  • 100 μm

  • 25 μm

  • 50 μm

  • 75 μm


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19.

It takes 4.6 eV to remove one of the least tightly bound electrons from a metal surface. When monochromatic photons strike the metal surface, electrons having kinetic
energy from zero to 2.2 eV are ejected. What is the energy of the incident photons ?

  • 2.4 eV

  • 2.2 eV

  • 6.8 eV

  • 4.6 eV


20.

If the work functions of three photosensitive materials are 1 eV, 2 eV and 3 eV respectively, then the ratio of the respective frequencies of light that produce photoelectrons of maximum kinetic energy of 1 eV from each of them is

  • 1 : 2 : 3

  • 2 : 3 : 4

  • 1 : 1 : 1

  • 3 : 2 : 1


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