## Dual Nature Of Radiation and Matter Quiz-2

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.

Q11. The linear momentum of photon is p. The wavelength of photon is Î» , then (h is Planck constant)
•  Î»=hp
•  Î»=h/p
•  Î»=p/h
•  Î»=p2/h
Solution
Momentum of photon, p=h/Î» Therefore, wavelength of photon, Î»=h/p

Q12.A 100 W light bulb is placed at the centre of a spherical chamber of radius 0.10m. Assume that 66% of the energy supplied to the bulb is converted into light and that the surface of chamber is perfectly absorbing. The pressure exerted by the light on the surface of the chamber is
•   0.87×10-6Pa
•  1.77×10-6Pa
•  3.50×10-6Pa
•  None of these
Solution

Q13.  The speed of an electron having a wavelength of 10-10 m is
•  7.25×106 m/s
•   6.26×106 m/s
•  5.25×106 m/s
•  4.24×106 m/s
Solution

Q14. A proton, a deuteron and an Î±-particle having the same momentum, enters a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. Then the ratio of deflections suffered by them is

•  1 :2 :8
•  1 :2 :4
•  1 :1 :2
•  None of these
Solution

Q15.For harder X-rays
•  The wavelength is higher
•  The intensity is higher
•  The frequency is higher
•  The frequency is lower
Solution
The frequency is higher

Q16. Momentum of a photon is p. The corresponding wavelength is
•  h/√p
• p/h
•  ph
•  h/p
Solution
E=hv=hc/Î»= mc2,
hence Î»=h/mc = h/p

Q17.Penetrating power of X-rays depends on
•  Current flowing in the filament
•  Applied potential difference
•  Nature of the target
•  All the above
Solution
The potential difference across the filament and target determines the energy and hence the penetrating power of X-rays

Q18.If V be the accelerating voltage, then the maximum frequency of continuous X-rays is given by
•  eh/V
•  hV/e
•  eV/h
•  h/eV
Solution
E=eV=hvmax
vmax=eV/h

Q19.Solid targets of different elements are bombarded by highly energetic electron beams. The frequency (f) of the
characteristic X-rays emitted from different targets varies with atomic number Z as
•  f∝√Z
•  f∝Z2
•  f∝Z
•  f∝Z3/2
Solution

Q20. If the momentum of an electron is changed by ∆p, then the de-Broglie wavelength associated with it changes by 0.50%. The initial momentum of the electron will be
•  ∆p/200
•  ∆p/199
•  199 ∆p
• 400 ∆p
Solution

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