Characteristics of Light

Q.

Which colour of the light has the longest wavelength ?

1. Red

2. Blue

3. Green

4. Violet

Q.

The frequency range of visible light is from $3.75\times {10}^{14}Hz$ to $7.5\times {10}^{-14}$ Hz. Calculate its wavelength range. Take speed of light = $3\times {10}^{8}m{s}^{-1}$

Q.

A RADAR sends a signal to an aeroplane at a distance 300 km away, with a speed of $3\times {10}^{8}m{s}^{-1}$. After how much time is the signal received back after reflecting from the aeroplane?

Q.

Light is a form of _________ .

Q.

A monochromatic beam of light passes from air into a glass block. When the ray of light passes from air to glass, the wavelength of light changes. As the ray of light passes from air to glass its wavelength will :

1. Increase

2. Decrease

3. Remains constant

4. Increase or decrease depending on the type of radiation

Q.

How does the speed of light in glass change on increasing the wavelength of light ?

Q.

An object placed in one medium when seen from the other medium, appears to be vertically shifted. Name two factors on which the magnitude of shift depends and state how does it depend on them.

Q. Speed of light in vacuum is $km{s}^{-1}$

1. $3\times {10}^8$
2. $3\times {10}^5$
3. $3\times {10}^6$
4. $3\times {10}^7$

Q.

Choose the correct options and fill in the blank:

Light is a form of __________ (energy/ force) which gives the sensation of sight.

Q.

A monochromatic beam of light passes from air into a glass block.

An expression that relates the wavelength of light, with the speed of light in air and the speed of light in glass is:

1. 

2. 

3. 

4. 

Q. Light can behave both as a wave and as an array of particles.

1. True
2. False

Q.

Light is not a form of energy.

1. True
2. False

Q.

A monochromatic point source of light 'O' is seen through a rectangular glass block ABCD. Paths of two rays, in and outside the block, are shown in the given figure.

How does the shift depend on the thickness (AD or BC) of the block?

1. The shift decreases with increase in the thickness of the glass block

2. The shift increases or decreases with increase in the thickness of the glass block depending on the wavelength of light

3. The shift is not affected by increase in the thickness of the glass block

4. The shift increases with increase in the thickness of the glass block

Q. Blue light has a shorter wavelength compared to the red light.

1. True
2. False

Q.

Let's try recalling a few facts

1. Inverted
2. All surfaces
3. Erect
4. Quickest path

Q.

According to Einstein's General Theory of Relativity, light can be bend using gravity. Is this scientifically proven ? If yes, then does this defies the rectilinear property of light ? Which property does light show here (ray, particle or wave) ?

Q.

What is the speed of light in vacuum?

1. $3\times {10}^{10}\mathrm{m}/\mathrm{s}$

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

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

4. $1.5\times {10}^8\mathrm{m}/\mathrm{s}$

Q.

Consider the following statements:

Statement 1: 1 AU = 15.8 millions of a light year

Statement 2: 1 light year = 6.32 $\times$ ${10}^4$ AU

1. Statement 1 is true; Statement 2 is false

2. Statement 1 is false; Statement 2 is true

3. Both statements are true

4. Both statements are false

Q.

The speed of light in air is: (a) $3\times {10}^{8}cm/s$ (b) $3\times {10}^{8}mm/s$ (c) $3\times {10}^{8}km/s$ (d) $3\times {10}^{8}m/s$

Q.

Among the given options, wavelength of which colour light is the shortest?

1. Blue

2. Yellow

3. Red

4. Green

Q. The frequency range of visible light is from 3.75 × 10¹⁴ Hz to 7.5 × 10¹⁴ Hz. Calculate its wavelength range. Take speed of light = 3 × 10⁸ m s^-1

Q. What will happen to the wavelength of light when it goes from optically rarer to denser medium

Q.

Does the refractive index of an object chqnges when we use light of different wavelength/ colors?

Q. Question 5
During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, $3\times {10}^{8}m{s}^{-1}$

Q. The speed of light in vacuum is ______.

1. $3\times {10}^8\text{m}{\text{s}}^{-1}$
2. $3\times {10}^9\text{m}{\text{s}}^{-1}$
3. $8\times {10}^3\text{m}{\text{s}}^{-1}$
4. $300\times {10}^8\text{m}{\text{s}}^{-1}$

Q.

The speed of light in glass, on increasing the wavelength of light in glass

1. Increases

2. Decreases

3. Remains constant

4. Increases to a certain extent and then decreases

Q. Light can behave both as a wave and as an array of particles.

1. True
2. False

Q. In a uniform medium, light travels in a straight line.

1. True
2. False

Q.

Let's try recalling a few facts

1. Inverted
2. Erect
3. All surfaces
4. Quickest path

Q. A real image is formed when the rays of light converge.

1. True
2. False