Wave Optics Test

Result

Wave Optics Test - 61

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Rank
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Weekly Quiz Competition

Question 1
4 / -1

An astronaut floating freely in space decide to use his flash light as a rocket. He shines a 10 watt light beam in a fixed direction so that he acquires momentum in the opposite direction. If his mass is 80 kg, how long must be need to reach a velocity of 1 ms^–1

A
9 s

B
2.4 × 10³ s

C
2.4 × 10⁶ s

D
2.4 × 10⁹ s

Solution
Question 2
4 / -1

A beam of light consisting of two wavelengths 650 nm and 520 nm is used to illuminate the slit of a Young\'s double slit experiment. Then the order of the bright fringe of the longer wavelength that coincide with a bright fringe of the shorter wavelength at the least distance from the cetnral maximum is

A
1

B
2

C
3

D
4

Solution
Question 3
4 / -1

Two identical radiators have a separation of d = λ/4 where λ is the wavelength of te waves emitted by either source. The initial phase difference between the source is π/4. Then the intensity on the screen at a distant point situated at an angle θ = 30° from the radiators is (here I₀ is intensity at that due to one radiator alone)

A
I₀

B
2I₀

C
3I₀

D
4I₀

Solution
Question 4
4 / -1

In Young\'s double slit experiment, the 8th maximum with wavelength λ₁ is at a distance d₁ from the central maximum and the 6th maximum with a wavelength λ₂ is at a distance d₂. Then (d₁/ λ₂) is equal to

A

B

C

D

Solution
Question 5
4 / -1

Light of wavelength 500 nm is used to form interference pattern in Young\'s double slit experiment. A uniform glass plate of refractive index 1.5 and thickness 0.1 mm is introduced in the path of one of the interfering beams. The number of fringes which will shift the cross wire due to this is

A
100

B
200

C
300

D
400

Solution
Question 6
4 / -1

The two coherent sources of equal intensity produce maximum intensity of 100 unit at a point. If the intensity of one of the sources a is reduced by 36% by reducing its width then the intensity of light at the same point will be

A
90

B
89

C
67

D
81

Solution
Question 7
4 / -1

The figure shows four pairs of polarising sheets, seen face-on. Each pair is mounted in the path of initially unpolarized light. The polarizing direction of each sheet (indicated by the dashed line) is referenced to either a horizontal x-axis or a vertical y axis. Rank the pair according to the fraction of the initial intensity that they pass, greatest first.

A
(i) > (ii) > (iii) > (iv)

B
(i) > (iv) > (ii) > (iii)

C
(i) > (iii) > (ii) > (iv)

D
(iv) > (iii) > (ii) > (i)

Solution
Question 8
4 / -1

In a Young\'s double slit experiment, I₀ is the intensity at the central maximum and β is the fringe width. The intensity at a point P distant x from the centre will be

A

B

C

D

Solution
Question 9
4 / -1

In a Fresnel\'s diffraction arrangement, the screen is at a distance of 2 metre from a circular aperture. It is found that for light of wavelengths λ₁ and λ₂ the radius of 4th zone for λ₁ coincides with the radius of 5th zone for λ₂. Then the ratio λ₁ : λ₂ is

A

B

C

D

Solution
Question 10
4 / -1

If n represents the order of a half period zone, the area of this zone is approximately proportional to n^m where m is equal to

A
Zero

B
Half

C
One

D
Two