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A galaxy is receding relative to us at a speed of 3000 km/sec. It emits hydrogen red line of wavelength 6500 A0. When seen by us the wave length of this radiation will appear to be
  • a)
    higher by approximately 131 Å
  • b)
    lower by approximately 31 Å
  • c)
    lower by approximately 3 Å
  • d)
    higher by approximately 31 Å
Correct answer is option 'A'. Can you explain this answer?
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A galaxy is receding relative to us at a speed of 3000 km/sec. It emit...
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A galaxy is receding relative to us at a speed of 3000 km/sec. It emit...
The wavelength of light is affected by the Doppler effect when the source of light is moving relative to the observer. The formula for the observed wavelength is given by:

λ' = λ * (1 + v/c)

Where λ' is the observed wavelength, λ is the actual wavelength, v is the relative velocity of the source, and c is the speed of light.

In this case, the galaxy is receding from us at a speed of 3000 km/sec. Converting this to meters per second, we get:

v = 3000 km/sec * 1000 m/km = 3 x 10^6 m/sec

The speed of light, c, is approximately 3 x 10^8 m/sec.

Substituting these values into the formula, we get:

λ' = 6500 A * (1 + (3 x 10^6 m/sec)/(3 x 10^8 m/sec))

Simplifying this expression gives:

λ' = 6500 A * (1 + 0.01)

λ' = 6500 A * 1.01

λ' ≈ 6565 A

Therefore, when seen by us, the wavelength of the hydrogen red line radiation emitted by the galaxy will appear to be higher by approximately 131 A0 (6565 A - 6500 A).
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A galaxy is receding relative to us at a speed of 3000 km/sec. It emit...
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A galaxy is receding relative to us at a speed of 3000 km/sec. It emits hydrogen red line of wavelength 6500 A0. When seen by us the wave length of this radiation will appear to bea)higher by approximately 131 Åb)lower by approximately 31 Åc)lower by approximately 3 Åd)higher by approximately 31 ÅCorrect answer is option 'A'. Can you explain this answer?
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A galaxy is receding relative to us at a speed of 3000 km/sec. It emits hydrogen red line of wavelength 6500 A0. When seen by us the wave length of this radiation will appear to bea)higher by approximately 131 Åb)lower by approximately 31 Åc)lower by approximately 3 Åd)higher by approximately 31 ÅCorrect answer is option 'A'. Can you explain this answer? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about A galaxy is receding relative to us at a speed of 3000 km/sec. It emits hydrogen red line of wavelength 6500 A0. When seen by us the wave length of this radiation will appear to bea)higher by approximately 131 Åb)lower by approximately 31 Åc)lower by approximately 3 Åd)higher by approximately 31 ÅCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A galaxy is receding relative to us at a speed of 3000 km/sec. It emits hydrogen red line of wavelength 6500 A0. When seen by us the wave length of this radiation will appear to bea)higher by approximately 131 Åb)lower by approximately 31 Åc)lower by approximately 3 Åd)higher by approximately 31 ÅCorrect answer is option 'A'. Can you explain this answer?.
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