Wave Nature of Light

Q. The distance between two successive crests or troughs of a wave is known as _______.

1. frequency
2. energy
3. wavelength
4. amplitude

Q. The number of waves that pass through a point in a unit time is called its ____.

1. wavelength
2. frequency
3. amplitude
4. displacement

Q. Characteristics of electromagnetic waves are:

1. Wavelength
2. Frequency
3. Velocity
4. Time

Q. The frequency of an electromagnetic wave is 3 x ${10}^7$ Hz. Its wavelength is:

1. 1 m
2. 10 m
3. 100 m
4. 1000 m

Q. Electromagnetic waves are produced by:

1. constant electric field
2. constant magnetic field
3. changing electric field and magnetic field
4. constant electric field and changing magnetic field

Q.

A certain electromagnetic wave has a wavelength of$625nm$. What is the frequency of the wave?

Q. By increasing the wavelength, the frequency of the wave also increases.

1. True
2. False

Q.

How to represent frequency? Also, what is the definition of frequency?

Q.

The main advantage of microwave is that-

1. Highly directive

2. Moves at the speed of light.

3. $\frac{\mathrm{S}}{\mathrm{n}}$ ratio greater.

4. High penetration power.

Q. Which of the following is the frequency of an electromagnetic wave with wavelength 1 m? (Speed of light, c = $3\text{x}{10}^8$m/s)

1. $3\text{x}{10}^8$ Hz
2. $3\text{x}{10}^7$ Hz
3. $3\text{x}{10}^5$ Hz
4. $3\text{x}{10}^6$ Hz

Q. What would be the frequency of the wave if it has wavelength of $100\text{nm}$?
Speed of light = $3\times {10}^8\text{m/s}$

1. $3\times {10}^3\text{Hz}$
2. $3\times {10}^{15}\text{Hz}$
3. $3\times {10}^{13}\text{Hz}$
4. $3\times {10}^8\text{Hz}$

Q.

The vibration period of a medium particle is $0.01s$. What is the frequency of waves?

Q. If the frequency of a certain wave is $200se{c}^{-1}$, what would be the energy of the wave?

1. $6.626\times {10}^{-34}$ J
2. $6.626\times {10}^{30}$ J
3. $13.252\times {10}^{-34}$ J
4. $13.252\times {10}^{-32}$ J

Q. The unit of frequency is ______.

1. metre
2. Hertz
3. second
4. coulomb

Q.

In vacuum,

1. speed of red light is equal to the speed of yellow light

2. speed of red light is greater than the speed of yellow light

3. speed of yellow light is greater than the speed of red light

4. none of these

Q. The distance between the two consecutive crests is called wavelength.

1. False
2. True