Electromagnetic Spectrum

Q.

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

1. X-ray radiations

2. Gamma radiations

3. Ultraviolet radiations

4. Infrared radiations

Q.

Which of the following is the correct relation between frequency (f), speed (C) and wavelength $\left(\lambda \right)$ of an electromagnetic radiation?

1. $f=\frac{\lambda }{C}$

2. $C=\frac{\lambda }{f}$

3. $C=f\times \lambda$

4. $f=C\times \lambda$

Q.

Which ray in Electromagnetic Spectrum is present in cosmic radiation?

1. UV rays

2. Gamma rays

3. Visible light

4. Infrared rays

Q.

___coloured light has the largest wavelength in the visible spectrum.

Q.

Which of the following has the same value for all waves when travelling through vacuum?

1. Speed

2. Wavelength

3. Frequency

4. Amplitude

Q.

Which ray in Electromagnetic spectrum is produced by crystal oscillator?

1. UV rays

2. Microwaves

3. Infrared waves

4. Gamma rays

Q.

Vitamin D in plants are produced by which ray in Electromagnetic Spectrum?

1. Gamma rays

2. UV rays

3. X-rays

4. Infrared rays

Q.

Infrared radiations are absorbed by the glass but are transmitted by rock salt.

1. True

2. False

Q.

Light is a form of electromagnetic radiation. Which statement about light waves is NOT true?

1. It has a varying amplitude.

2. Its wavelength can vary.

3. It can pass through the vacuum.

4. It cannot pass through the vacuum.

Q.

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm, then find the speed of the wave.

1. $6\times {10}^{8}m/s$

2. $3\times {10}^{8}m/s$

3. $9\times {10}^{8}m/s$

4. $12\times {10}^{8}m/s$