Select the correct answer from each list.(2 points)
When a vibrating object is moving
an observer, the measured frequency of the vibrations will be lower than if the object and observer are both stationary. If the vibrating object is moving
an observer, the measured frequency of the vibrations will be higher than the actual rate of vibration of the object. When a star is moving towards an observer on Earth, the light spectrum of the star will appear
compared to the light spectrum of the sun, which is considered to be in Earth's frame of reference.
When a vibrating object is moving
- Away from an observer
When the vibrating object is moving
- Towards an observer
When a star is moving towards an observer on Earth, the light spectrum of the star will appear
- Blue shifted
When a vibrating object is moving **towards** an observer, the measured frequency of the vibrations will be **higher** than if the object and observer are both stationary. If the vibrating object is moving **away from** an observer, the measured frequency of the vibrations will be **lower** than the actual rate of vibration of the object. When a star is moving **towards** an observer on Earth, the light spectrum of the star will appear **blueshifted** compared to the light spectrum of the sun, which is considered to be in Earth's frame of reference.
To select the correct answer from each list, we need to understand the concepts mentioned. Let's break it down:
1. When a vibrating object is moving [toward/away from] an observer, the measured frequency of the vibrations will be [lower/higher] than if the object and observer are both stationary.
To determine the correct answer, we need to consider the Doppler effect. The Doppler effect refers to the change in frequency or wavelength of a wave as a result of the relative motion between the source of the wave and the observer.
When a vibrating object is moving toward an observer, the observed frequency of the vibrations will be higher than if the object and observer are both stationary. This is because the motion of the object compresses the waves, causing the observed frequency to increase.
Therefore, the correct answer is:
When a vibrating object is moving toward an observer, the measured frequency of the vibrations will be higher than if the object and observer are both stationary.
2. When a star is moving towards an observer on Earth, the light spectrum of the star will appear [redshifted/blueshifted] compared to the light spectrum of the sun, which is considered to be in Earth's frame of reference.
In the context of light, the Doppler effect also applies. When a star is moving toward an observer on Earth, the observed light spectrum of the star will be blueshifted. This means that the wavelengths of the light waves emitted by the star will be compressed due to the motion, causing the light to appear shifted towards the blue end of the spectrum.
Therefore, the correct answer is:
When a star is moving towards an observer on Earth, the light spectrum of the star will appear blueshifted compared to the light spectrum of the sun, which is considered to be in Earth's frame of reference.