NEET Physics: Dual Nature of Matter — MCQ Test 8

Q6. The threshold frequency of a metal is \( 4.8 \times 10^{14} \, \text{Hz} \). What is the maximum kinetic energy for light of frequency \( 6.8 \times 10^{14} \, \text{Hz} \)? (Take \( h = 6.63 \times 10^{-34} \, \text{J s} \))

Q7. The threshold wavelength for a metal is \( 600 \, \text{nm} \). What is its work function in eV? (Take \( h c = 1240 \, \text{eV nm} \))

Q8. Light of wavelength \( 450 \, \text{nm} \) is incident on a metal with work function \( 1.9 \, \text{eV} \). What is the maximum kinetic energy in eV? (Take \( h c = 1240 \, \text{eV nm} \))

Q9. The minimum wavelength of X-rays from a \( 25 \, \text{kV} \) tube is: (Take \( h = 6.63 \times 10^{-34} \, \text{J s} \), \( c = 3 \times 10^8 \, \text{m/s} \), \( e = 1.6 \times 10^{-19} \, \text{C} \))

Q10. The maximum frequency of X-rays produced by a \( 20 \, \text{kV} \) tube is: (Take \( h = 6.63 \times 10^{-34} \, \text{J s} \), \( e = 1.6 \times 10^{-19} \, \text{C} \))

NEET Physics — Dual Nature of Matter

Free MCQ Test 8 of 9

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Medium

What happens to photoelectric emission if the frequency of incident light is below the threshold frequency?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Dual Nature of Matter. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Photoelectric, Emission, Frequency, Incident, Threshold, and Wavelength.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. What happens to photoelectric emission if the frequency of incident light is below the threshold frequency?

  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Stops completely

Q2. The de Broglie wavelength of a particle of mass \( 5.0 \times 10^{-30} \, \text{kg} \) moving at \( 2.0 \times 10^5 \, \text{m/s} \) is:

  • A. 0.6 nm
  • B. 0.663 nm
  • C. 0.7 nm
  • D. 0.8 nm

Q3. The de Broglie wavelength of an electron is \( 0.2 \, \text{nm} \). What is its speed? (Take \( h = 6.63 \times 10^{-34} \, \text{J s} \), \( m_e = 9.11 \times 10^{-31} \, \text{kg} \))

  • A. 3.0 × 10⁶ m/s
  • B. 3.5 × 10⁶ m/s
  • C. 3.64 × 10⁶ m/s
  • D. 4.0 × 10⁶ m/s

Q4. The momentum of a photon is \( 2.21 \times 10^{-27} \, \text{kg m/s} \). What is its wavelength? (Take \( h = 6.63 \times 10^{-34} \, \text{J s} \))

  • A. 250 nm
  • B. 280 nm
  • C. 300 nm
  • D. 320 nm

Q5. Which scientist proposed that moving particles of matter exhibit wave-like properties?

  • A. Albert Einstein
  • B. J.J. Thomson
  • C. Max Planck
  • D. Louis de Broglie

+ 5 more questions in the actual test

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