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JEE Advanced Dual Nature of Radiation and Matter — practice questions — page 2

Explore 58 free Dual Nature of Radiation and Matter questions in JEE Advanced Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Dual Nature of Radiation and Matter questions and exercises with answers

Showing questions 31–58 of 58.

NEET · Physics · Photoelectric — Spot the ErrorRead the answer and worked solution →The specific charge (e/m) of the electron, determined by J. J. Thomson, is approximatelyRead the answer and worked solution →Millikan's oil-drop experiment established thatRead the answer and worked solution →The work function φ₀ of a metal is best defined asRead the answer and worked solution →1 electron-volt (eV) equalsRead the answer and worked solution →The stopping potential V₀ at a given frequency of incident light isRead the answer and worked solution →The K_max of the emitted photoelectron is related to the stopping potential V₀ byRead the answer and worked solution →Metals like Li, Na, K and Cs are photosensitive even to visible light because theyRead the answer and worked solution →If the frequency of incident light is doubled while the intensity is halved, the number of photoelectrons emitted per secondRead the answer and worked solution →The threshold frequency ν₀ for a metal is related to its work function byRead the answer and worked solution →Cathode rays were first identified byRead the answer and worked solution →An electron accelerated through 100 V has kinetic energy (in eV) equal toRead the answer and worked solution →Trace photoelectrons to their causeRead the answer and worked solution →Knock out the photoelectric mythsRead the answer and worked solution →Knock out the false photon claimsRead the answer and worked solution →Catch the false line on lightRead the answer and worked solution →Intensity or frequencyRead the answer and worked solution →Place the discoveriesRead the answer and worked solution →Who did whatRead the answer and worked solution →Type the quantum termRead the answer and worked solution →Pop the ultraviolet metalsRead the answer and worked solution →One word is wrongRead the answer and worked solution →Order the argumentRead the answer and worked solution →Radiation and matterRead the answer and worked solution →Which one does not belongRead the answer and worked solution →Does it change the energyRead the answer and worked solution →Spot the false statementRead the answer and worked solution →NEET · Physics · Photoelectric — Spot the ErrorRead the answer and worked solution →

Worked practice questions

NEET · Physics · Photoelectric — Spot the Error

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Questions
  1. Statement parts
    1. The
    2. photoelectric
    3. effect
    4. supports
    5. the
    6. wave
    7. nature
    8. of
    9. light
    10. .
    Correction
    particle
    Incorrect part
    wave
  2. Statement parts
    1. The
    2. work
    3. function
    4. of
    5. a
    6. metal
    7. increases
    8. with
    9. temperature
    10. .
    Correction
    is characteristic of the metal
    Incorrect part
    increases
  3. Statement parts
    1. Maximum
    2. kinetic
    3. energy
    4. of
    5. photoelectrons
    6. depends
    7. on
    8. light
    9. intensity
    10. .
    Correction
    frequency
    Incorrect part
    intensity
  4. Statement parts
    1. Number
    2. of
    3. photoelectrons
    4. emitted
    5. is
    6. proportional
    7. to
    8. light
    9. frequency
    10. .
    Correction
    intensity
    Incorrect part
    frequency
Instructions
Tap the wrong word in each photoelectric statement.

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The specific charge (e/m) of the electron, determined by J. J. Thomson, is approximately

  1. 1.76 × 10¹¹ C/kg
  2. 1.76 × 10⁷ C/kg
  3. 1.60 × 10⁻¹⁹ C/kg
  4. 9.11 × 10⁻³¹ C/kg
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Correct answer: A. 1.76 × 10¹¹ C/kg

1. J. J. Thomson used crossed E and B fields to measure e/m of cathode-ray particles. 2. The accepted value is e/m ≈ 1.76 × 10¹¹ C/kg. 3. e = 1.602 × 10⁻¹⁹ C from Millikan; m = 9.11 × 10⁻³¹ kg follows from these two. 4. This value is universal, independent of cathode material. _Source: syllabus Physics, Ch 11 "Dual Nature of Radiation and Matter", §11.1_

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Millikan's oil-drop experiment established that

  1. Electric charge is a continuously variable smooth quantity
  2. Electric charge is quantised in integer multiples of e
  3. The mass of the electron is one gram in ordinary units
  4. Electrons carry no electric charge in an atomic system
Show answer and solution

Correct answer: B. Electric charge is quantised in integer multiples of e

1. Millikan (1913) measured charges on tiny oil droplets suspended by an electric field. 2. Every measured charge was an integer multiple of 1.602 × 10⁻¹⁹ C. 3. This proved that electric charge is quantised. 4. Combined with e/m, it enabled a precise electron mass measurement. _Source: syllabus Physics, Ch 11 "Dual Nature of Radiation and Matter", §11.1_

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