## Dual Nature Of Radiation and Matter Quiz-5

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.

Q41.  The figure shows variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations.Let Ia,Ib and Ic be the intensities and va,vb and vc be the frequencies for the curves a,b and c respectively. Then
•  va=vb and Ia≠Ib
•   va=vc and Ia=Ic
•  va=vb and Ia=Ib
•  vb=vc and Ib=Ic
Solution
Saturation current is proportional to intensity while stopping potential increases with increase in frequency. Hence, va=vb while Ia<Ib

Q42.The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectron is
•  Double the earlier value
•  Unchanged
•  More than doubled
•  Less than doubled
Solution

Q43.  For an electron in the second orbit of Bohr’s hydrogen atom, the moment of linear momentum is
•   Ï€h
•  2Ï€h
•  h/Ï€
•  2h/Ï€
Solution

Q44. The wavelength of a 1 keV photon is 1.24×10-9m. What is the frequency of 1 MeV photon?
•  2.4×1015Hz
•  2.4×1020Hz
•  1.24×1015Hz
•  1.24×1020Hz
Solution

Q45.The ratio transmitter operates on a wavelength of 1500 m at a power of 400 kW. The energy of radio photon (in joule) is
•  1.32×10-24 J
•  1.32×10-28 J
•  1.32×10-26J
•  1.32×10-32J
Solution
The energy of photon is E=hv=hc/Î» Hence, energy of radio photon is E=6.6×10^(-34)×2×10^5 J (∵v=c/Î»=(3×10^8)/1500=2×10^5 Hz) ∴ E=1.32×10^(-28) J

Q46. In an X-rays tube, the intensity of the emitted X-rays beam is increased by
•  Increasing the filament current
•  Decreasing the filament current
• Increasing the target potential
•  Decreasing the target potential
Solution
By changing the filament current with the help of rheostat, thermionic emission intensity of X-rays can be changed

Q47. Light of wavelength 4000 â„« is incident on a metal plate whose work function is 2 eV. The maximum KE of the emitted photoelectron would be
•  0.5 eV
•  1.1 eV
•  0.15 eV
•  2 eV
Solution

Q48.Kinetic energy of emitted cathode rays is dependent on
•  Only voltage
•  Only work function
•  Both (a) and (b)
•  It does not depend upon any physical quantity
Solution
Higher the voltage, higher is the KE. Higher the work function, smaller is the KE

Q49.When cathode-rays strike a metal target of high melting point with a very high velocity, then which of the following are produced
•  Î±-rays
•  X-rays
•  Ultraviolet rays
•  Î³-waves
Solution
X-rays

Q50. The correctness of velocity of an electron moving with velocity 50 ms-1 is 0.005%. The accuracy with which its position can be measured will be
•  4634×10-3 m
•  4634×10-5 m
•  4634×10-6 m
• 4634×10-8 m
Solution

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