The doppler effect changes the wavelength of the light emitted, depending upon whether source is moving away or coming towards the detector.
Doppler effect in light is actually a relativistic effect (caused due to relativistic time dilaton and can be explained by special theory of relativity) but somewhat similar to the one which happens in sound waves. This effect has nothing to do with the bending in spacetime.
When the source is moving away from the detector, the wavelength of the light emitted from the source appears to be increased as seen by the detector (think of a wave being stretched), as a result the frequency decreases (since, speed of light is constant in all frames). Due to this decrease in frequency the light emitted from the source appears more red (since red color is on low frequency side in the electromagnetic spectrum) compared to the situation when source was at rest.
Vice versa for the source moving towards the detector
This shift in frequency is also known as doppler shift.
The shift in frequency when the source is moving away is known as redshift and the opposite one is known as blueshift.
Answer:
High gradient
Explanation:
The river bed of a stream is eroded when the local water velocity at the river is high. This occurs when the river gradient is high (meaning it slopes steeply) usualy higher up the river close to the watershed. This is different from when the river has low gradient which results in low water speeds. In this case, sediments in the river settle and erosion mostly happen on the river banks.
Answer:
Explanation:
transform faults, where tectonic plates are grinding past each other.
I am pretty sure it is mT