NEET Physics: Electromagnetic Waves — Practice Set 23

Q1. Why are radio waves used in communication systems like cellular phones?

Q2. What is the frequency range of the AM radio band?

Q3. What is the approximate wavelength range of X-rays?

Q4. What property of electromagnetic waves allows them to exhibit phenomena like interference?

Q5. What is the primary source of gamma rays mentioned in the document?

Q6. Which type of electromagnetic waves are produced by the vibration of atoms and molecules?

Q7. What is the expression for displacement current as given in the document?

Q8. An electromagnetic wave in vacuum has an electric field amplitude of \( 60 \, \text{V/m} \). What is the magnetic field amplitude? (Given \( c = 3 \times 10^8 \, \text{m/s} \))

Q9. What type of charges cannot produce electromagnetic waves?

Q10. What physical quantity is the same for all electromagnetic waves in vacuum?

Physics — Electromagnetic Waves

Set 23 of 24

15:00

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Why are radio waves used in communication systems like cellular phones?