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Dual Nature of ...

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  • Question 1
    4 / -1

    From the figure describing photoelectric effect we may infer correctly that

  • Question 2
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    The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows

  • Question 3
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    The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

  • Question 4
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    The graph between 1 / λ and stopping potential (V) of three metals having work functions ϕ1, ϕ2 and ϕ3 in an experiment of photo-electric effect is plotted as shown in the figure. Which of the following statement(s) is/are correct? [Here λ is the wavelength of the incident ray]

  • Question 5
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    When photon of energy 4.25 eV strike the surface of a metal A, the ejected photoelectrons have maximum kinetic energy TA eV and de-Broglie wavelength λA. The maximum kinetic energy of photoelectrons liberated from another metal B by photon of energy 4.70 eV is TB = (TA – 1.50) eV. If the de-Broglie wavelength of these photoelectrons is λB = 2λA, then

  • Question 6
    4 / -1

    The potential difference applied to a X-ray tube is increased. As a result, in the emitted radiation

  • Question 7
    4 / -1

    Photoelectric effect support quantum nature of light because

  • Question 8
    4 / -1

    The threshold wavelength, for photoelectric emission, from a material is 5200 Å. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a

  • Question 9
    4 / -1

    The shortest wavelength of X-rays emitted from an X-ray tube depends on

  • Question 10
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    An X-ray tube is operating at 50 kV and 20 mA. The target material of the tube has a mass of 1.0 kg and specific heat 495 J kg–1° C–1. One percent of the supplied electric power is converted into X-rays and the entire remaining energy goes into heating the target. Then

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