Exposure to noise is proportional to time
Answers
NO
Increase in time doesn't decide exposure of noice.
Answer:
Explanation:
The Signal (S) is the number of photons detected from a source. In practice, we don't detect all the photons that arrive on the detector, only a fraction of them are converted to electrons and detected (the ratio electron/photon is the quantum efficiency; it is typically 50-85% for a CCD). So, in what follows, we will work only in electrons.
The total signal S is related to the number of electrons we get per seconds, s [e-/s] (the [] marks the units and/or dimensions) and the total exposure time, t [s]: S = s . t [e].
In many cases, the total exposure time t is split in various exposures. To keep the "infrared" notation,
t = NDIT . DIT
where NDIT is the number of exposures and DIT is the individual exposure times. So,
S = s . NDIT . DIT