What are ultraviolet rays? Give two uses.

Important Questions on Electromagnetic Waves and Communication System

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

What are radio waves? Give its two uses.

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Name the most harmful radiation entering the Earth's atmosphere from the outer space.

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Name the three basic units of any communication system.

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Why high frequency carrier waves are used for transmission of audio signals?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

What is modulation?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

What is meant by noise?

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Calculate the frequency in MHz of a radio wave of wavelength 250 m. Remember that the speed of all EM waves in vacuum is $3 \times$ ${10}^{8 }$ $m/s$

EASY

11th Maharashtra Board

IMPORTANT

Physics>Chapter 13 - Electromagnetic Waves and Communication System>Exercises>Q 2

Calculate the wavelength in nm of an X-ray wave of frequency $2.0 \times {10}^{18} Hz$