Dual-Nature-Of-Radiation-and-Matter-Quiz-6

Dual Nature Of Radiation and Matter Quiz-6

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Q51. In Davisson - Germer experiment maximum intensity is observed at

•   54^oand 54 V
•  54^oand 50 V
•  50^oand 50 V
•  65^oand 50 V

Solution
We know that in Davisson-Germer experiment maximum intensity is observed at 54^oand 50 V.

Q52.According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum

•  Energy and momentum
•  Speed and momentum
•  Speed only
•  Energy only

Solution
Speed of photon is 3×10⁸ m/s in vacuum

Q53.  X-rays are

•   Stream of electrons
•  Stream of positively charged particles
•  Electromagnetic radiantions of high frequency
•  Stream of uncharged particles

Solution
Electromagnetic radiantions of high frequency

Q54. Work function of lithium and copper are respectively 2.3 eV and 4.0 eV. Which one of the metal will be useful for the photoelectric cell working with visible light (h=6.6×10^-34 J-s,c=3×10⁸ m/s)

•  Lithium
•  Copper
•  Both
•  None of these

Solution

                

                           

Q55. For characteristic X-ray of some material

•  E(K_γ)<E(K_β )<E(K_α)
•  E(K_α )<E(L_α )<E(M_α)
•  λ(K_γ )<λ(K_β )<λ(K_α)
•  λ(M_α)<λ(L_α )<λ(K_α)

Solution
  ∵E(K_<γ )>E(K_β )>E(K_α )⇒λ(K_γ )<λ(K_β )<λ(K)

Q56. What is the de-Broglie wavelength of the α-particle accelerated through a potential difference VIn an X-rays tube, the intensity of the emitted X-rays beam is increased by

•  0.287/√V Å
• 12.27/√V Å
•  0.101/√V Å
•  0.202/√V Å

Solution
                          

Q57.The radius of the orbital of electron in the hydrogen atom is 0.5 Å. The speed of the electron is 2×10⁶ m/s. Then the
current in the loop due to the motion of the electron is

•  1 mA
•  1.5 mA
•  1.5 mA
•  2 mA

Solution
                       

Q58.An electron with (rest mass m₀) moves with a speed of 0.8c. Its mass when it moves with this speed is

•  m₀
•  m₀/6
•  5m₀/3
•  3m₀/5

Solution
                  

Q59.The minimum energy required to remove an electron is called

•  Stopping potential
•  Kinetic energy
•  Work function
•  None of these

Solution
Work function

Q50. Consider the following two statements A and B and identify the correct choice in the given answer A: The characteristic X-ray spectrum depends on the nature of the material of the target B: The short wavelength limit of continuous X-ray spectrum varies inversely with the potential difference applied to the X-rays tube

•  A is true and B is false
•  A is false and B is true
•  Both A and B are true
• Both A and B are false

Solution
Both A and B are true