When will a scientist observe redshift in the spectrum of a distant space object? (1 point)
when the object is moving away from the scientist
when the object is stationary
when the object is moving toward the scientist
when the object is in the same frame of reference as the scientist
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The correct answer is: when the object is moving away from the scientist.
The correct answer is: when the object is moving away from the scientist.
The correct answer is: "When the object is moving away from the scientist."
Redshift refers to the phenomenon where the light from a distant space object appears to have longer wavelengths (shifted toward the red end of the spectrum) compared to the expected wavelengths. This happens when the object is moving away from the observer, stretching the light waves and making them appear longer.
To understand why this occurs, we can use the Doppler effect. Just like the sound of an approaching ambulance siren sounds higher in pitch and then lowers as it moves away, light waves also experience a similar effect. When an object is moving away from the scientist, the observed light waves are stretched out, resulting in a longer wavelength and a shift towards the red end of the spectrum.
On the other hand, if the object is stationary or moving towards the scientist, there would be a different effect called blueshift. This means that the wavelengths of light would appear compressed and shifted towards the blue end of the spectrum. However, the question specifically asks for the observation of redshift, which occurs when the object is moving away from the scientist.