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Chapter 1: Electric Charges and Fields
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Chapter 2: Electrostatic Potential and Capacitance
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Chapter 3: Current Electricity
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Chapter 4: Moving Charges and Magnetism
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Chapter 5: Magnetism and Matter
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Chapter 6: Electromagnetic Induction
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Chapter 7: Alternating Current
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Chapter 8: Electromagnetic Waves
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Chapter 9: Ray Optics and Optical Instruments
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Chapter 10: Wave Optics
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Chapter 12: Atoms
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Chapter 13: Nuclei
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Chapter 14: Semiconductor Electronics Materials
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Chapter 15: Communication Systems
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1.
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Which one of the following elements will require the highest energy to take out an electron from them?
Pb, Ge, C and Si
(a) Ge (b) C (c) Si (d) Pb
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2.
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The energy of a photon of wavelength 663 nm is
(a) 6.64 × 10–20 J (b) 5.18 × 10–19 J (c) 3.0 × 10–19 J (d) 2.0 × 10–20 J
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3.
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Select the correct answer from the codes (a), (b), (c) and (d) as given below.
Assertion (A): Photoelectric effect demonstrates the particle nature of light.
Reason (R): Photoelectric current is proportional to intensity of incident radiation for frequencies more than the threshold frequency.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is true, but Reason (R) is false.
(d) Assertion (A) is false and Reason (R) is also false.
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4.
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Which one of the following metals does not exhibit emission of electrons from its surface when irradiated by visible light?
(a) Rubidium (b) Sodium (c) Cadmium (d) Caesium
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5.
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A graph is plotted between the stopping potential (on y-axis) and the frequency of incident radiation (on x-axis) for a metal. The product of the slope of the straight line obtained and the magnitude of charge on an electron is equal to:
(a) h (b)
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1.
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Why is wave theory of electromagnetic radiation not able to explain photo electric effect? How does photon picture resolve this problem?
(CBSE 2019, 2M)
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2.
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A particle is associated with a de Broglie wave of wavelength 1.2 nm. The kinetic energy of the particle is made four times. Calculate the new value of the wavelength of the wave.
(CBSE 2023, 3M)
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3.
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(a) How does one explain the emission of electrons from a photosensitive surface with the help of Einstein’s photoelectric equation?
(b) Work function of aluminium is 4·2 eV. If two photons each of energy 2·5 eV are incident on its surface, will the emission of electrons take place? Justify your answer.
(c) The stopping potential in an experiment on photoelectric effect is 1·5 V. What is the maximum kinetic energy of the photoelectrons emitted? Calculate in Joules.
(CBSE 2019, 3M)
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4.
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How would the stopping potential for a given photosensitive surface change if (1) the frequency of the incident radiation were increased? And (ii) the intensity of incident radiation were decreased ? Justify your answer.
(CBSE 2023, 2M)
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5.
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Plot a graph showing the variation of photo electric current, as a function of anode potential for two light beams having the same frequency but different intensities I1, and I2 (I1 > I2). Mention its important features.
(CBSE 2023, 2M)
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Chemistry
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Biology
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Mathematics
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Physical Education
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Chapter Name
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Sub Topics of Chapter 11: Dual Nature of Radiation and Matter
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Dual Nature of Radiation and Matter
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11.1 Introduction
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11.2 Electron Emission
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11.3 Photoelectric Effect
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11.4 Experimental Study of Photoelectric Effect
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11.5 Einstein’s Photoelectric Equation
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11.6 Particle Nature of Light: The Photon
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11.7 Wave Nature of Matter
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11.8 Davisson and Germer Experiment
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