Teaching JKPSC Lecturership Mock Test Series 2024-25 Physical Sciences Classical Mechanics Special Theory of Relativity
The Hα spectral line of hydrogen is one of its most prominent features, appearing as a bright red line with a wavelength of \(656.1 \times 10^{-9}\) meters. Calculate the expected wavelength of the Hα line observed from a star moving away from Earth at a speed of 3000 km/s.
1
15
2
20
3
25
4
30