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MCQ for Full Syllabus Physics Dual Nature Of Radiation and Matter
Full Syllabus Physics students should refer to the following multiple-choice questions with answers for Dual Nature Of Radiation and Matter in Full Syllabus. These MCQ questions with answers for Full Syllabus Physics will come in exams and help you to score good marks
Dual Nature Of Radiation and Matter MCQ Questions Full Syllabus Physics with Answers
Question: When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are v and 2v respectively. The work function of the metal is (h - Planck's constant, c = velocity of light in air)
- a) 2 hc ×106 J
- b) 1.5 hc × 106 J
- c) hc × 106 J
- d) 0.5 hc × 106 J
Answer: 2 hc ×106 J
Question: Find the number of photons emitted per second by a 25 watt source of monochromatic light of wavelength 6600 Å. What is the photoelectric current assuming 3% efficiency for photoelectric effect ?
- a)
- b)
- c)
- d) None of these
Answer:
Question: The beam of light has three wavelengths 4144Å, 4972Å and 6216 Å with a total intensity of 3.6 × 10–3 Wm2 equally distributed amongst the three wavelengths. The beam falls normally on the area 1 cm2 of a clean metallic surface of work function 2.3 eV. Assume that there is no loss of light by reflection and that each energetically capable photon ejects one electron. Calculate the number of photoelectrons liberated in 2s.
- a) 2 × 109
- b) 1.075 × 1012
- c) 9 × 108
- d) 3.75 × 106
Answer: 1.075 × 1012
Question: When 0.50 Å X-rays strike a material, the photoelectrons from the k shell are observed to move in a circle of radius 23 mm in a magnetic field of 2 × 10–2 tesla acting perpendicularly to the direction of emission of photoelectrons. What is the binding energy of k-shell electrons?
- a) 3.5 keV
- b) 6.2 keV
- c) 2.9 keV
- d) 5.5 keV
Answer: 3.5 keV
Question: The threshold wavelength of the tungsten is 2300 Å. If ultraviolet light of wavelength 1800 Å is incident on it, then the maximum kinetic energy of photoelectrons would be about –
- a) 1.49 eV
- b) 2.2 eV
- c) 3.0 eV
- d) 5.0 eV
Answer: 1.49 eV
Question: de-Broglie wavelength of an electron accelerated by a voltage of 50 V is close to (|e| = 1.6 × 10–19 C, me = 9.1 × 10–31 kg, h = 6.6 × 10–34 Js) :
- a) 2.4 Å
- b) 0.5 Å
- c) 1.7 Å
- d) 1.2 Å
Answer: 1.7 Å
Question: The variation of maximum kinetic energy of photoelectrons with applied frequency (υ) is
- a)
- b)
- c)
- d)
Answer:
Question: A light having wavelength 300 nm fall on a metal surface. The work function of metal is 2.54 eV, what is stopping potential ?
- a) 2.3 V
- b) 2.59 V
- c) 1.59 V
- d) 1.29 V
Answer: 1.59 V
Question: If the energy of a photon is 10 eV, then its momentum is
- a) 5.33 × 10–23 kg m/s
- b) 5.33 × 10–25 kg m/s
- c) 5.33 × 10–29 kg m/s
- d) 5.33 × 10–27 kg m/s
Answer: 5.33 × 10–27 kg m/s
Question: The photoelectric threshold of Tungsten is 2300Å. The energy of the electrons ejected from the surface by ultraviolet light of wavelength 1800Å is
- a) 0.15 eV
- b) 1.5 eV
- c) 15 eV
- d) 150 e
Answer: 0.15 eV
Question: A material particle with a rest mass m0 is moving with a velocity of light c. Then the wavelength of the de Broglie wave associated with it is :
- a) (h/m0c)
- b) zero
- c) ∞
- d) (m0c/h)
Answer: zero
Question: In a photoelectric experiment, with light of wavelength λ, the fastest electron has speed v. If the exciting wavelength is changed to 3λ/4, the speed of the fastest emitted electron will become
- a)
- b)
- c)
- d)
Answer:
Question: An electron of mass m and charge e initially at rest gets accelerated by a constant electric field E. The rate of change of de-Broglie wavelength of this electron at time t ignoring relativistic effects is
- a)
- b)
- c)
- d)
Answer:
Question: The wavelength of Kα-line characteristic X-rays emitted by an element is 0.32 Å. The wavelength of Kβ-line emitted by the same element will be
- a) 0.32 Å
- b) 0.39 Å
- c) 0.49 Å
- d) 0.27 Å
Answer: 0.27 Å
Question: An electron of mass ‘m’, when accelerated through a potential V has de-Broglie wavelength λ. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be –
- a)
- b)
- c)
- d)
Answer:
Question: If the momentum of electron is changed by P, then the de Broglie wavelength associated with it changes by 0.5%. The initial momentum of electron will be
- a) 200 P
- b) 400 P
- c)
- d) 100 P
Answer: 200 P
Question: The photoelectric threshold of Tungsten is 2300Å. The energy of the electrons ejected from the surface by ultraviolet light of wavelength 1800Å is
- a) 0.15 eV
- b) 1.5 eV
- c) 15 eV
- d) 150 eV
Answer: 0.15 eV
Question: If the energy of a photon is 10 eV, then its momentum is
- a) 5.33 × 10–23 kg m/s
- b) 5.33 × 10–25 kg m/s
- c) 5.33 × 10–29 kg m/s
- d) 5.33 × 10–27 kg m/s
Answer: 5.33 × 10–27 kg m/s
Question: A light having wavelength 300 nm fall on a metal surface. The work function of metal is 2.54 eV, what is stopping potential ?
- a) 2.3 V
- b) 2.59 V
- c) 1.59 V
- d) 1.29 V
Answer: 1.59 V
Question: A material particle with a rest mass m0 is moving with a velocity of light c. Then the wavelength of the de Broglie wave associated with it is :
- a) (h/m0c)
- b) Zero
- c) ∞
- d) (m0c/h)
Answer: Zero
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BITSAT Full Syllabus Physics Dual Nature Of Radiation and Matter MCQs
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MCQs for Physics BITSAT Full Syllabus Dual Nature Of Radiation and Matter
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Dual Nature Of Radiation and Matter BITSAT Full Syllabus MCQs Physics
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BITSAT MCQs Physics Full Syllabus Dual Nature Of Radiation and Matter
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