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NCERT Solutions › Physics › Chapter 8

Chapter 8: Electromagnetic Waves

NCERT Solutions for CBSE Class 10 Physics — 31 solved questions with detailed explanations.

31
Questions
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Topics

Solved Questions

Q1. Electromagnetic waves are produced by:

Difficulty: Easy · Topic: EM Wave Production

Solution

Accelerating charges produce electromagnetic waves (changing electric field creates changing magnetic field).

Q2. The speed of electromagnetic waves in vacuum is given by:

Difficulty: Easy · Topic: EM Wave Speed

Solution

c = 1/√(μ₀ε₀) ≈ 3 × 10⁸ m/s.

Q3. Which of the following has the highest frequency?

Difficulty: Easy · Topic: EM Spectrum

Solution

Order of increasing frequency: Radio < Microwave < IR < Visible < UV < X-ray < Gamma.

Q4. The electromagnetic radiation with highest wavelength is:

Difficulty: Easy · Topic: EM Spectrum

Solution

The EM wave with highest wavelength is Radio waves.

Q5. The electromagnetic radiation with used in RADAR is:

Difficulty: Easy · Topic: EM Spectrum

Solution

The EM wave with used in RADAR is Microwaves.

Q6. The electromagnetic radiation with used in night vision cameras is:

Difficulty: Easy · Topic: EM Spectrum

Solution

The EM wave with used in night vision cameras is Infrared.

Q7. The electromagnetic radiation with used in medical imaging of bones is:

Difficulty: Easy · Topic: EM Spectrum

Solution

The EM wave with used in medical imaging of bones is X-rays.

Q8. The electromagnetic radiation with used for sterilization is:

Difficulty: Easy · Topic: EM Spectrum

Solution

The EM wave with used for sterilization is Ultraviolet.

Q9. The electromagnetic radiation with produced in nuclear reactions is:

Difficulty: Easy · Topic: EM Spectrum

Solution

The EM wave with produced in nuclear reactions is Gamma rays.

Q10. The electromagnetic radiation with used in optical fibres is:

Difficulty: Easy · Topic: EM Spectrum

Solution

The EM wave with used in optical fibres is Infrared (or visible).

Q11. The electromagnetic radiation with can cause skin burns and tanning is:

Difficulty: Easy · Topic: EM Spectrum

Solution

The EM wave with can cause skin burns and tanning is Ultraviolet.

Q12. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 3×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q13. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 4×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q14. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 5×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q15. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 6×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q16. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 7×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q17. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 8×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q18. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 9×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q19. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 10×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q20. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 11×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q21. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 12×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q22. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 13×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q23. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 14×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q24. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 15×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q25. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 16×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q26. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 17×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q27. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 18×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q28. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 19×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q29. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 20×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q30. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 21×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Q31. EM waves travel at speed c = 3×10⁸ m/s. Wavelength of 22×10¹⁴ Hz radiation is:

Difficulty: Easy-Medium · Topic: EM Waves

Solution

λ = c/f.

Other Chapters in Physics

Ch 1: Electric Charges & FieldsCh 2: Electrostatic PotentialCh 3: Current ElectricityCh 4: Moving Charges & MagnetismCh 5: Magnetism & MatterCh 6: Electromagnetic InductionCh 7: Alternating CurrentCh 9: Ray OpticsCh 10: Wave OpticsCh 11: Dual Nature of RadiationCh 12: AtomsCh 13: NucleiCh 14: Semiconductor Electronics

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