Start learning →

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

Explore 54 free Dual Nature of Radiation and Matter questions in JEE Main Physics. Open each question or exercise to read its content, reference answers and available explanation.

Practise Dual Nature of Radiation and Matter with Quill →

Dual Nature of Radiation and Matter questions and exercises with answers

Showing questions 31–54 of 54.

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 →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 →Charging a pith ball by conductionRead the answer and worked solution →Charging a pith ball by conductionRead the answer and worked solution →

Worked practice questions

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
Show answer and solution

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_

Open this question →

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_

Open this question →

The work function φ₀ of a metal is best defined as

  1. The kinetic energy of the fastest photoelectron
  2. The frequency of incident light
  3. The minimum energy needed to escape from the metal surface
  4. The stopping potential at a specific frequency
Show answer and solution

Correct answer: C. The minimum energy needed to escape from the metal surface

1. Free electrons in a metal are held by attractive electrostatic forces near the surface. 2. To escape, they must gain a certain minimum energy. 3. That minimum energy is the work function, φ₀, measured typically in eV. 4. It depends on the metal and the state of its surface. _Source: syllabus Physics, Ch 11 "Dual Nature of Radiation and Matter", §11.2_

Open this question →

How to practise

  1. Choose a Dual Nature of Radiation and Matter question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

Put it into practice

Continue with Dual Nature of Radiation and Matter practice for JEE Main. Read explanations as you go. No signup form needed to start.

Practise Dual Nature of Radiation and Matter →

More Physics topics

Electric Charges and FieldsMechanical Properties of Solids and FluidsSemiconductor ElectronicsWave OpticsCurrent ElectricityUnit 2A: Newton's Laws and Translational EquilibriumMoving Charges and MagnetismAtoms and Nuclei