Why do scientists observe blueshift in certain stars?(1 point)
Responses
Light wave frequencies increase as an object moves toward the observer.
Light wave frequencies increase as an object moves toward the observer.
Stars with higher temperatures emit more light waves at the blue end of the spectrum.
Stars with higher temperatures emit more light waves at the blue end of the spectrum.
Light wave frequencies decrease as an object moves toward the observer.
Light wave frequencies decrease as an object moves toward the observer.
Stars with lower temperatures emit more light waves at the blue end of the spectrum.
Light wave frequencies increase as an object moves toward the observer.
Which situations might cause two observers (A and B) to measure different frequencies for the same vibrating object? Select the two correct answers. (2 points)
Responses
Observer A and Observer B are stationary but at different distances from the vibrating object.
Observer A and Observer B are stationary but at different distances from the vibrating object.
Observer A and Observer B are moving at different speeds relative to each other.
Observer A and Observer B are moving at different speeds relative to each other.
Observer A and Observer B are both stationary and at the same distance from the object.
Observer A and Observer B are both stationary and at the same distance from the object.
Observer A is stationary and Observer B is moving.
Observer A and Observer B are stationary but at different distances from the vibrating object.
Observer A and Observer B are moving at different speeds relative to each other.
When will a scientist observe redshift in the spectrum of a distant space object?(1 point)
Responses
when the object is moving toward the scientist
when the object is moving toward the scientist
when the object is stationary
when the object is stationary
when the object is moving away from the scientist
when the object is moving away from the scientist
when the object is in the same frame of reference as the scientist
when the object is moving away from the scientist
Scientists observe blueshift in certain stars because light wave frequencies increase as an object moves toward the observer. This means that if a star is moving towards us, its light waves will appear shifted towards the blue end of the spectrum. Additionally, stars with higher temperatures emit more light waves at the blue end of the spectrum, which can also contribute to the observed blueshift.
The correct answer is: Light wave frequencies increase as an object moves toward the observer.
When scientists observe blueshift in certain stars, it means that the light waves emitted by those stars have higher frequencies than expected. This phenomenon occurs when an object is moving towards the observer. As the object moves closer, the wavelengths of the light waves it emits get compressed, resulting in an increase in frequency. In the case of stars, the higher frequencies correspond to the blue end of the spectrum.
To understand this concept, imagine a star emitting light waves as it moves towards Earth. As the star moves closer, the distance between the wave crests decreases, causing the wavelengths to shorten. Because wavelength and frequency are inversely related, the shorter wavelengths lead to higher frequencies. This is why scientists observe blueshift in certain stars - the light waves emitted by those stars are "squeezed" into higher frequencies due to their motion towards Earth.
Scientists can measure this blueshift in the spectrum of light emitted by stars by examining the displacement of certain characteristic lines in the spectrum. By analyzing this shift, scientists can determine not only the direction of motion but also the speed at which the star is moving towards or away from us.