Question

shorter wavelength
longer wavelength
spectral lines of hydrogen from a distant star
shorter wavelength
longer wavelength
compared to the spectral lines observed in the laboratory, the spectral lines observed in the light from the dist
a the red end of the spectrum, indicating the stars movement toward earth.
b the red end of the spectrum, indicating the stars movement away from earth.
c the blue end of the spectrum, indicating the stars movement toward earth.
d the blue end of the spectrum, indicating the stars movement away from earth.

Explanation:

When a star moves away from Earth, its light is redshifted. Red - shifting means the spectral lines shift towards the red end (longer wavelength) of the spectrum due to the Doppler effect. When a star moves towards Earth, it is blueshifted (spectral lines shift towards the blue end or shorter wavelength). Since the star is moving away, the spectral lines will shift to the red end.

Answer:

B. The red end of the spectrum, indicating the star's movement away from Earth.