Question

The period of rotation of the sun at its equator is T and its radius is R. Then the Doppler wavelength shift expected for light with wavelength λ emitted from the edge of the sun's disc is: [c = speed of light]

Options

• ± `(pi"R"lambda)/"cT"`

• ± `("T"lambda)/(2pi"Rc")`

• ± `(2pi"Rc")/("T"lambda)`

• ± `(2pi"R"lambda)/("cT")`

Answer 1

`bb("±" (2pi"R"lambda)/("cT"))`

Explanation:

Δλ = ± `"v"/"c" lambda`

v = Rω = `("R"2pi)/"T"` 

Δλ = ± `(2pi"R"lambda)/("cT")`