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Dual Nature Of Radiation and Matter Quiz-3

Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 


Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 



Q21. If the potential difference between the anode and cathode of the X-ray tube is increase
  •  The peaks at R and S would move to shorter wavelength
  •  The peaks at R and S would remain at the same wavelength
  •  The cut off wavelength at P would increase
  •  (b) and (c) both are correct
Solution
Peaks on the graph represent characteristic X-ray spectrum. Every peak has a certain wavelength, which depends upon the transition of electron inside the atom of the targe. While λmin depends upon the accelerating voltage [As λmin∝1/V]

Q22.If the wavelength of incident light changes from 400 nm to 300 nm, the stopping potential for photoelectrons emitted from a surface becomes approximately
  •  1.0 V greater
  •   1.0 V smaller
  •  0.5 V greater
  •  0.5 V smaller
Solution
                          



Q23.  In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be
  •   2V
  •  Less than 2V
  •  Zero
  •  Greater than 2 V
Solution
                          


Q24. If a photon has velocity c and frequency v, then which of following represents its wavelength
  •  hc/E
  •  hv/c
  •  hv/c2
  •  hv
Solution
E=hc/λ
⇒λ=hc/E


Q25.What is de-Broglie wavelength of electron having energy 10 ke V?
  •  0.12Å
  •  1.2Å
  •  12.2Å
  •  None of these
Solution
                       



Q26. An oil drop with charge q is held stationary between two plates with an external potential difference of 400 V. If the size of the drop is doubled without any change of charge, the potential difference required to keep the drop stationary will be
  •  400 V
  • 1600 V
  •  3200 V
  •  4000 V
Solution
                   



Q27.Planck’s constant has the dimensions of
  •  Energy
  •  Mass
  •  Frequency
  •  Angular momentum
Solution
                      

Q28.The work function of a metal is
  •  The energy for the electron to enter into the metal
  •  The energy for producing X-ray
  •  The energy is required for an electron to come out from metal surface
  •  None of these
Solution
None of these

Q29.An oxide coated filament is useful in vacuum tubes because essentially
  •  It has high melting point
  •  It can withstand high temperatures
  •  It has good mechanical strength
  •  It can emit electrons at relatively lower temperatures
Solution
It can emit electrons at relatively lower temperatures

Q30. The photoelectric effect can be understood on the basis of
  •  The principle of superposition
  •  The electromagnetic theory of light
  • The special theory of relativity
  •  Line spectrum of the atom
Solution
Line spectrum of the atom

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