Questions on the Doppler’s Effect
1a) In 1999 a planet was discovered orbiting a star in the constellation
of Pegasus. State one reason why it is difficult to make a direct
observation of this planet.
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1b) The initial discovery of the planet was made using the radial
velocity which involved measuring a Doppler shift in the spectrum of the
star. Explain how an orbiting planet causes a Doppler shift in the
spectrum of a star.
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2a) Treated as a single source, the Andromeda galaxy has an apparent
magnitude of 2.54 and an absolute magnitude of -20.62. Calculate the
distance to the Andromeda galaxy.
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1a) In 1999 a planet was discovered orbiting a star in the constellation
of Pegasus. State one reason why it is difficult to make a direct
observation of this planet.
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1b) The initial discovery of the planet was made using the radial
velocity which involved measuring a Doppler shift in the spectrum of the
star. Explain how an orbiting planet causes a Doppler shift in the
spectrum of a star.
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2a) Treated as a single source, the Andromeda galaxy has an apparent
magnitude of 2.54 and an absolute magnitude of -20.62. Calculate the
distance to the Andromeda galaxy.
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