NCERT/Class 12/Physics/Electromagnetic Waves

Electromagnetic Waves

Class 12 · Physics

42 questions14 easy16 medium12 hard

Sample Questions

Q1.A plane EM wave has the electric field component Ez = 60 V/m sin(0.5 × 10³x + 1.5 × 10¹¹t). What is the frequency of this wave?

  • A1.5 × 10¹¹ Hz
  • B1.5 × 10¹¹/(2π) Hz ≈ 23.9 GHz
  • C0.5 × 10³ Hz
  • D0.5 × 10³/(2π) Hz

Q2.Which of the following is NOT a property of electromagnetic waves?

  • AThey are transverse waves
  • BThey can travel through vacuum
  • CThey require a material medium for propagation
  • DThey travel at 3 × 10⁸ m/s in free space

Q3.The frequency of visible light ranges approximately from:

  • A4 × 10¹⁴ Hz to 7 × 10¹⁴ Hz
  • B4 × 10¹² Hz to 7 × 10¹² Hz
  • C4 × 10¹⁰ Hz to 7 × 10¹⁰ Hz
  • D4 × 10⁸ Hz to 7 × 10⁸ Hz

Q4.Who first experimentally demonstrated the existence of electromagnetic waves in 1887?

  • AMarconi
  • BMaxwell
  • CHertz
  • DBose

Q5.Who introduced the concept of displacement current to remove the inconsistency in Ampere's circuital law?

  • AFaraday
  • BHertz
  • CMaxwell
  • DAmpere

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

Ampere-Maxwell LawDisplacement CurrentElectromagnetic SpectrumElectromagnetic WavesGamma RaysInfrared WavesMaxwell's EquationsMicrowavesRadio WavesRelation between E and BSpeed of EM WavesUltraviolet WavesVisible LightX-rays

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