Radio Waves

Q.

Which of the following has longest wavelength?

1. Gamma rays

2. Ultraviolet rays

3. Radio waves

4. Red light

Q.

Which among the given radiations has the highest wavelength and can be used for radio and television communications?

1. X-ray radiations

2. Radio waves

3. Ultraviolet radiations

4. Infrared radiations

Q.

What are the four types of electromagnetic radiations which reaches the earth surface from the Sun?

Q.

Mention one use of part of electromagnetic spectrum to which a wavelength of $21cm$ emitted by hydrogen in interstellar space belong

Q.

Why do We Use Electromagnetic Spectrum

Q. Match the following:

1. a-2; b-3; c-4; d-1
2. a-1; b-2; c-3; d-4
3. a-3; b-2; c-1; d-4
4. a-4; b-3; c-2; d-1