When will a scientist observe redshift in the spectrum of a distant space object?(1 point)
a. when the object is moving away from the scientist
b. when the object is moving toward the scientist
c. when the object is in the same frame of reference as the scientist
d. when the object is stationary
a. when the object is moving away from the scientist
a. when the object is moving away from the scientist.
The correct answer is a. When a scientist observes redshift in the spectrum of a distant space object, it means that the object is moving away from the scientist.
Redshift is a phenomenon where the wavelength of light coming from a source becomes longer (shifted towards the red end of the spectrum) due to the Doppler effect as the source moves away from the observer. This can be observed in the spectrum of light emitted by distant objects, such as galaxies or quasars.
To determine the redshift of an object, scientists analyze the spectrum of light emitted by that object. They look for characteristic features called spectral lines, which correspond to specific wavelengths of light emitted or absorbed by particular elements or molecules.
If the lines in the observed spectrum are shifted towards longer wavelengths compared to their known positions in the laboratory, it indicates that the object is moving away from the scientist. The greater the redshift, the faster the object is receding from the observer.
Therefore, when a scientist observes redshift in the spectrum of a distant space object, it is a strong indication that the object is moving away from the scientist.