Wave Optics Test

Result

Wave Optics Test - 37

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Weekly Quiz Competition

Question 1
4 / -1

A rocket is moving away from the earth at a speed of 6 × 10⁷ m/s. The rocket has blue light in it. What will be the wavelength of light recorded by an observer on the earth? (wavelength of blue light = 4600 Å)

A
4600 Å

B
5520 Å

C
3680 Å

D
3920 Å

Solution
Question 2
4 / -1

A spectral line λ = 5000 Å in the light coming from a distant star is observed as a 5200 Å. What will be recession velocity of the star?

A
1.15 × 10⁷ cm/s

B
1.15 × 10⁷ m/s

C
1.15 × 10⁷ km/s

D
1.15 km/s

Solution
Question 3
4 / -1

Three observes A, B and C measure the speed of light coming from a source to be v_A, v_B and v _C. The observer A moves towards the source, the observer C moves away from the source with the same speed. The observer B stays stationary. The surrounding space is vacuum every where. Then

A
v_A > v_B > v_C

B
v_A < v_B < v_C

C
v_A = v_B = v_C

D
v_A = v_B > v_C
Question 4
4 / -1

The velocity of light emitted by a source S observed by an observer O, who is at rest with respect to S is c. If the observer moves towards S with velocity v, the velocity of light as observed will be

A

B

C
c

D
Question 5
4 / -1

In the context of Doppler effect in light, the term \'red shift\' signifies

A
Decrease in frequency

B
Increase in frequency

C
Decrease in intensity

D
Increase in intensity
Question 6
4 / -1

The sun is rotating about its own axis. The spectral lines emitted from the two ends of its equator, for an observer on the earth, will show

A
Shift towards red end

B
Shift towards violet end

C
Shift towards red end by one line and towards violet and by other

D
No shift
Question 7
4 / -1

A star is moving away from the earth with a velocity of 100 km/s. If the velocity of light is 3 × 10⁸m/s then the shift of its spectral line of wavelength 5700 Å due to Doppler\'s effect will be

A
0.63 Å

B
1.90 Å

C
3.80 Å

D
5.70 Å

Solution
Question 8
4 / -1

If a source of light is moving away from a stationary observer, then the frequency of light wave appears to change because of

A
Doppler's effect

B
Interference

C
Diffraction

D
None of these
Question 9
4 / -1

A star emitting radiation at a wavelength of 5000 Å is approaching earth with a velocity of 1.5 × 10⁶ m/s. The change in wavelength of the radiation as received on the earth, is

A
25 Å

B
Zero

C
100 Å

D
2.5 Å

Solution
Question 10
4 / -1

A star emitting light of wavelength 5896 Å is moving away from the earth with a speed of 3600 km/s. The wavelength of light observed on earth will
(c = 3 x 108 m/s is the speed of light)

A
Decrease by 5825.25 Å

B
Increase by 5966.75 Å

C
Decrease by 70.75 Å

D
Increase by 70.75 Å

Solution