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The 6563 Å line emitted by hydrogen atom in a star is found to be red shifted by 5 Å. The speed with which the star is receding from the earth is
Options
(a) 17.29 x 10⁹ m/s
(b) 4.29 x 10⁷ m/s
(c) 3.39 x 10⁵ m/s
(d) 2.29 x 10⁵ m/s
Correct Answer:
2.29 x 10⁵ m/s
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
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Topics: Wave Optics
(101)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The decay constant of a radio isotope is λ. If A₁ and A₂ are its activities at time
- A gas of monoatomic hydrogen is bombarded with a stream of electrons
- A particle covers half of its total distance with speed v1 and the rest half distance
- When the rate of flow of charge through a metallic conductor
- A body has 80 microcoulomb of charge. Number of additional electrons in it will be
Topics: Wave Optics (101)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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question it self is wrong
THE CORRECT ONE WILL BE:
Q: The 6563A∘Hα6563A∘Hα line emitted by hydrogen in a star is found to be red shifted by 15∘A15∘A Estimate the speed with which the star is receding from the earth .
−6.86×105ms−16.86×105ms−1−6.86×10−5ms−16.86×10−5ms−1−6.86×105ms−16.86×105ms−1−6.86×10−5ms−16.86×10−5ms−1
Solution : given : λ=6563∘Aλ=6563∘A
Δλ=15∘AΔλ=15∘A
Δλ=−ΔλλΔλ=−Δλλcc
=−156563=−156563×3×108×3×108
=−6.86×105ms−1=−6.86×105ms−1
Answer : −6.86×105ms−1