NEET Electromagnetic Waves — Set 18

Question 1

An electromagnetic wave in vacuum has an angular frequency $ \omega = 4 \times 10^{11} \, \text{rad/s} $. What is its frequency in Hz?

Accepted Answer

Frequency $ v = \frac{\omega}{2\pi} $. Given $ \omega = 4 \times 10^{11} \, \text{rad/s} $, $ v = \frac{4 \times 10^{11}}{2 \pi} \approx 6.37 \times 10^{10} \, \text{Hz} $.

Question 2

Which of the following statements about the electromagnetic spectrum is true?

Accepted Answer

The document explains that the boundaries between different regions of the electromagnetic spectrum are not sharply defined, and there are overlaps.

Question 3

Why are ultraviolet rays used in sterilization processes?

Accepted Answer

Ultraviolet rays have high energy due to their short wavelengths, allowing them to disrupt molecular bonds in microorganisms, effectively killing them for sterilization purposes.

NEET Physics: Electromagnetic Waves — Practice Set 18

Q1. An electromagnetic wave in vacuum has an angular frequency \( \omega = 4 \times 10^{11} \, \text{rad/s} \). What is its frequency in Hz?

Q2. Which of the following statements about the electromagnetic spectrum is true?

Q3. Why are ultraviolet rays used in sterilization processes?

Q4. Why do electromagnetic waves not require a medium for propagation?

Q5. What is the approximate wavelength range of infrared waves as per the document?

Q6. In electromagnetic theory, what explains the constant speed of light in vacuum across all frequencies?

Q7. Why does exposure to UV radiation cause tanning of the skin?

Q8. Which frequency range corresponds to short wave bands used in radio communication?

Q9. Why are microwaves suitable for radar systems in aircraft navigation?

Q10. An electromagnetic wave in vacuum has a magnetic field amplitude of \( B_0 = 2 \times 10^{-8} \, \text{T} \). What is the electric field amplitude? (Given \( c = 3 \times 10^8 \, \text{m/s} \))