## Dual Nature Of Radiation and Matter Quiz-7

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.

Q61. Light of wavelength 1824 â„«, incident on the surface of a metal, produces photo-electrons with maximum energy 5.3 eV.When light of wavelength 1216 â„« is used, the maximum energy of photoelectrons is 8.7 eV. The work function of the metal surface is
•  3.5 eV
•  13.6 eV
•  6.8 eV
•  1.5 eV
Solution

Q62.The de-Broglie wavelength of a neutron at 927℃ is Î». What will be its wavelength at 27℃ ?
•  Î»/2
•  Î»/4
•  4Î»
•  2Î»
Solution

Q63.  The de-Broglie wavelength of a ball of mass 120 g moving at a speed of 20 m/s is
•   3.5×10-34 m
•  2.8×10-34 m
•  1.2×10-34 m
•  2.1×10-34 m
Solution

Q64. The potential difference applied to an X-ray tube is 5kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second is
•  2×1016
•  5×1016
•  1×1017
•  4×1015
Solution

Q65.The curves (a), (b) (c) and (d) show the variation between the applied potential difference (V) and the photoelectric current (i),at two different intensities of light (I1>I2 ). In which figure is the correct variation shown
•

•

•

•

Solution
I1>I2 (given) ⇒i1>i2 [∵i∝I]

Q66. The correct graph between the maximum energy of a photoelectron and the inverse of wavelength of the incident radiation is given by the curve
•  A
•  B
• C
•  None of the above
Solution

Q67.A potential difference of 10^4 V is applied across an X-ray tube. The ratio of the de-Broglie wavelength of X-rays produced is (e/m for electron=1.8×1011 Ckg-1
•  1/20
•  1/10
•  1
•  1/100
Solution

Q68.The rest mass of the photon is
•  0
•
•  Between 0 and ∞
•  Equal to that of an electron
Solution
0

Q69.What should be the velocity of an electron so that its momentum becomes equal to that of a photon of wavelength 5200 â„«?
•  700 ms-1
•  1000 ms-1
•  1400 ms-1
•  2800 ms-1
Solution

Q70. An electron of mass m and charge q is accelerated from rest in a uniform electric field of strength E. The velocity acquired by it as it travels a distance l is
•  √(2Eql/m)
•  √(2Eq/ml)
•  √(2Em/ql)
• √(Eq/ml)
Solution

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