Why the intensity of the radiation increases at a particular wavelength and decreases after that?
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Answer:
If wavelength is increased by passing from one medium to another, then the frequency is unchanged and so is the intensity (apart from some loss due to reflection at the interface). If wavelength is increased at the source, then the frequency decreases and so does the intensity.
It is the cause of increasing and decreasing of frequency. It happens while the wave passes from one medium to another medium. If the wave passes from a rarer to a denser medium then the frequency increases so the intensity of the wave increases and the reverse happens while the wave passes from a denser medium to a rarer medium then the frequency decrease so, the intensity of the wave decreases. Another thing happens that is the object creates vibration upto some range within which the wave experiences a high pressure and upto the level of the vibrating field the frequency increases so the intensity also increases and after the range the pressure on the wave decreases so, the frequency level too decreases and at the same time the intensity of the wave too decreases. And the another reason is the compression and refraction. Due to continuous compression and refraction the wave particles get displaced so, the frequency level gets decreased as a result the intensity of the wave too gets decreased.