JEE Main 2022 · 26 Jun · Shift 2 · Physics Q46

PhysicsSingle correct+4 / -1Question 46 of 90

For a specific wavelength 670 nm of light coming from a galaxy moving with velocity $v$ , the observed wavelength is 670.7 nm. The value of $v$ is :

3\times10^8

^{-1}

3\times10^{10}

^{-1}

3.13\times10^5

^{-1}

4.48\times10^5

^{-1}

Answer and worked solution

Official answer: C

Doppler shift. $v=c\dfrac{\Delta\lambda}\lambda=3\times10^8\times\dfrac{0.7}{670}\approx3.13\times10^5$ m s $^{-1}$ (moving away, red shift).

(C)

Topics:Huygens' principle

JEE Main 2022 · 26 Jun · Shift 2, Physics question 46