Wave Optics Test

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Wave Optics Test - 63

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Question 1
1 / -0

Wavefront means

A
All particles in it have same phase

B
All particles have opposite phase of vibration

C
Few particles are in same phase, are on opposite phase

D
None of these

Solution

Wavefront is the locus of all the particles which vibrates in the same phase.
Question 2
1 / -0

The ozone layer absorbs

A
Infrared radiation

B
Ultraviolet radiation

C
$$X-$$ rays

D
$$\gamma$$- rays

Solution

Ozone layer absorbs most of the $$UV$$ rays emitted by the sun.
Question 3
1 / -0

The range of wavelength of the visible light is

A
$$10\ A^o$$ to $$100\ A^o$$

B
$$4,000\ A^o$$ to $$8,000\ A^o$$

C
$$8,000\ A^o$$ to $$10,000\ A^o$$

D
$$10,000\ A^o$$ to $$15,000\ A^o$$

Solution

Wavelength of visible spectrum is $$3900\overset{o}{A} -7800\overset{o}{A}$$.
Question 4
1 / -0

Huygen's principle of secondary wavelets may be used to

A
Find the velocity of light in vacuum

B
Explain the particle behaviour of light

C
Find the new position of the wavefront

D
Explain photoelectric effect

Solution

Huygens' principle states that every point on a wave front may be considered as a source of secondary waves. The word interference is used to describe the superposition of two waves, whereas diffraction is interference produced by several waves. By this principle we can find the exact position of the next ripple/wavefront that is to be produced.
$$\therefore$$ the correct answer is option (C).
Question 5
1 / -0

In a Young's double slit experiment $$62$$ fringes are seen in visible region for sodium light of wavelength $$5893\overset{o}{A}$$. If violet light of wavelength $$4358\overset{o}{A}$$ is used in plane of sodium light, then number of fringes seen will be

A
$$54$$

B
$$64$$

C
$$74$$

D
$$84$$

Solution

To obtain the number of fringes:
$$n_1 \lambda_1=n_2 \lambda_2 $$

$$\Rightarrow 62\times 5893 =n_3 \times 4358$$

$$\Rightarrow n_2=84$$.
Question 6
1 / -0

The wave theory of light was given by

A
Maxwell

B
Olank

C
HUygen

D
Young

Solution

$$\textbf{Wave theory of light given by Huygen.}$$
Question 7
1 / -0

In two separate set ups of the Young's double slit experiment, fringes of equal width are observed when lights of wavelength in the ratio $$1:2$$ are used. If the ratio of the slit separation in the two cases is of the distance between the plane of the slits and the screen in the two set ups is

A
$$4:1$$

B
$$1:1$$

C
$$1:4$$

D
$$2:1$$

Solution

As $$\beta =\dfrac {\lambda D}{d}=\dfrac {\beta_1}{\beta_2}=\left(\dfrac {D_1}{D_2}\right)\left(\dfrac {\lambda_1}{\lambda_2}\right)\left(\dfrac {d_2}{d_1}\right)$$
$$\Rightarrow 1=\left(\dfrac {D_1}{D_2}\right)\times \left(\dfrac {1}{2}\right)\times \left(\dfrac {1}{2}\right) \Rightarrow \dfrac {D_1}{D_2} = \dfrac {4}{1}$$
Question 8
1 / -0

What is ozone hole

A
Hole in the ozone layer

B
Formation of ozone layer

C
Thinning of ozone layer in troposphere

D
Reduction in ozone thickness in stratosphere

Solution

Ozone hole is depletion of ozone layer in stratosphere because of gases like $$CFC'S$$ etc.
Question 9
1 / -0

Which radiation in sunlight, causes heating effect

A
Ultraviolet

B
Infrared

C
Visible light

D
All of these

Solution

Infared radiations are the one that cause heating effect.
Question 10
1 / -0

Select the right option in the following

A
Christiaan Huygens a contemporary of Newton established the wave theory of light by assuming that light waves were transverse

B
maxwell provide the compelling theoretical evidence that light is transverse wave

C
Thomas Young experimentally proved the wave behavior of light and Huygens assumption

D
All the statements give above, correctly answer the question "what is light "

Solution

In Huygen's principle the wave theory was established by assuming that the waves were longitudinal. So, option (A) is wrong.
In Maxwell's theory of light, he stated that light is a transverse wave and conducted multiple experiments to prove so. So, option (B) is correct.
Thomas Young conducted his double slit experiment and tried to prove the wave nature of light by proving that light undergoes interference which is a phenomenon showed by waves. He never proved the type of wave light is, i.e transverse or longitudinal. So, option (C) is wrong.
These statements mostly highlight the wave nature of light. They do not comment on the particle nature of light or the dual nature of light established. Hence, they clearly do not answer the question "what is light" correctly. So, option (D) is also wrong.

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Wave Optics Test - 63

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Wave Optics Test - 63

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SHARING IS CARING

Question 1

All particles in it have same phase

All particles have opposite phase of vibration

Few particles are in same phase, are on opposite phase

None of these

Solution

Question 2

Infrared radiation

Ultraviolet radiation

$$X-$$ rays

$$\gamma$$- rays

Solution

Question 3

$$10\ A^o$$ to $$100\ A^o$$

$$4,000\ A^o$$ to $$8,000\ A^o$$

$$8,000\ A^o$$ to $$10,000\ A^o$$

$$10,000\ A^o$$ to $$15,000\ A^o$$

Solution

Question 4

Find the velocity of light in vacuum

Explain the particle behaviour of light

Find the new position of the wavefront

Explain photoelectric effect

Solution

Question 5

$$54$$

$$64$$

$$74$$

$$84$$

Solution

Question 6

Maxwell

Olank

HUygen

Young

Solution

Question 7

$$4:1$$

$$1:1$$

$$1:4$$

$$2:1$$

Solution

Question 8

Hole in the ozone layer

Formation of ozone layer

Thinning of ozone layer in troposphere

Reduction in ozone thickness in stratosphere

Solution

Question 9

Ultraviolet

Infrared

Visible light

All of these

Solution

Question 10

Christiaan Huygens a contemporary of Newton established the wave theory of light by assuming that light waves were transverse

maxwell provide the compelling theoretical evidence that light is transverse wave

Thomas Young experimentally proved the wave behavior of light and Huygens assumption

All the statements give above, correctly answer the question "what is light "

Solution

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