Morden Physics Quiz for Fun & JEE/NEET preparation 13

Morden Physics Quiz is based on Post newtinian concept of Physics i.e, Quantum Physics and Relativity.

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#1. If the frequency of light in a photoelectric field is doubled, then the stopping potential will

#2. A point source of light is used in a photoelectric experiment. If this source is removed farther from the emitting metal, the stopping potential

#3. Which of the following is false about X-rays

#4. Which of the following produces stronger scintillation when it strikes a particular fluoroscent material

#5. Neither the mass number nor the atomic number changes during a radioactive disintegration. Which of the following particles is emitted in the decay process

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Morden Physics Quiz Explanation is given below

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Quantum Mechanics and Double Slit Experiment

1. eV0 = hf – hf0

   so if frequency of light (f) is doubled, the stopping potential will be , V’0= (2hf – hf0)/e

which is more than double of the original value.

2. The stopping potential will remain constant as the stopping potential doesn’t depend upon the intensity of the light source, i.e. it doesn’t matter whether the distance of the source is changed, which of course affects its intensity.

3. X-rays are diffracted by crystals, according to Bragg’s law.

4. Scintillation means flashes of light. Alpha ray produces stronger scintillation while striking a particular fluoroscent material. Beta ray also produces scintillation, but it’s comparatively weaker than that of alpha ray.

5. Photon doesn’t have any atomic or mass number. So, it doesn’t transform the parent nucleus into something new but just helps it reach the ground state from the excited state it was earlier in.

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Morden Physics Quiz

  1. If the frequency of light in a photoelectric field is
    doubled, then the stopping potential will
    a. be more than double ()
    b. be halved
    c. be doubled
    d. be less than doubled
  2. A point source of light is used in a photoelectric
    experiment. If this source is removed farther from the
    emitting metal, the stopping potential
    a. will decrease
    b. will increase
    c. will either decrease or increase
    d. will remain constant()
  3. Which of the following is false about X-rays?
    a. X-rays are not deflected by electric or magnetic fields.
    b. X-rays can’t be diffracted by crystals()
    c. Photographic plates are affected by X-rays
    d. All of the above
  4. Which of the following produces stronger scintillation
    when it strikes a particular fluorescent material?
    a. Alpha ray()
    b. Beta ray
    c. Gamma-ray
    d. Neutron
  5. Neither the mass number nor the atomic number
    changes during a radioactive disintegration. Which of the
    following particles is emitted in the decay process?
    a. Negative Beta particle
    b. Positron
    c. Photon()
    d. Proton
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