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.
The correct answer is - B. rainfall and chemical reaction.
The Great Buddha statue is under constant change and it is slowly but surely weathering bit by bit. The two biggest reasons for this are:
- The rainfall; the water from the rainfall is one of the biggest causes of weathering of the rocks, the water is known to decompose the rocks over time and the Great Buddha statue which is on an open space is not an exception of its influence.
- The chemical reactions; China has a huge problem with pollution. There's lots of pollutants in the air that are causing serious damage to most things, including the Great Buddha statue, and they contribute to quicker decomposing with their corrosive power and change in colour than anything else.
Answer:
After when it erupts the lava runs similarly to water, to the lowest point, then it hardens to rock.
The two main rivers are The River Murray and its tributary, the Darling River.