Use Equation 2-47 to obtain the gravitational redshift in terms of the wavelength . Use that result to determine the shift in wavelength of light

Use Equation 2-47 to obtain the gravitational redshift in terms of the wavelength λ. Use that result to determine the shift in wavelength of light emitted by a white dwarf star at 720.00 nm. Assume the white dwarf has the same mass as the Sun (1.99 x 10³⁰ kg) but a radius equal to only 1 percent of the solar radius R_Θ. (R_Θ = 6.96 x 10⁸ m.)

ds = c dt (dr + rd0 + r sin0 de) 2-47