An electromagnetic wave in vacuum has a wavelength of \( 6 \, \text{m} \). What is its frequency? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

Using \( v \lambda = c \), we have \( v = \frac{c}{\lambda} = \frac{3 \times 10^8}{6} = 5 \times 10^7 \, \text{Hz} \).

Which of the following cannot produce electromagnetic waves?

Electromagnetic waves are produced by accelerated charges. Stationary charges produce only electrostatic fields, not time-varying fields required for EM waves.

NEET Physics: Electromagnetic Waves — Practice Set 4 (10 MCQs)

Physics — Electromagnetic Waves

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Why are infrared waves sometimes referred to as heat waves?

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NEET Physics: Electromagnetic Waves — Practice Set 4

Q1. Why are infrared waves sometimes referred to as heat waves?

Q2. An electromagnetic wave in vacuum has a wavelength of \( 6 \, \text{m} \). What is its frequency? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

Q3. Which of the following cannot produce electromagnetic waves?

Q4. What physical implication arises from the fact that electromagnetic waves are transverse in nature?

Q5. An electromagnetic wave in vacuum has a magnetic field amplitude of \( B_0 = 4 \times 10^{-8} \, \text{T} \). What is the electric field amplitude? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

Q6. What fundamental asymmetry exists between electric and magnetic fields in Maxwell’s equations?

Q7. What physical principle explains why electromagnetic waves can exhibit interference and diffraction?

Q8. What is the typical wavelength range of microwaves used in domestic microwave ovens?

Q9. Why are microwaves used in satellite communication?

Q10. Why do microwaves heat food more effectively than infrared waves in domestic microwave ovens?