A sensor is exposed for time t to a lamp of power P placed at a distance l. The sensor has an opening that is 4d in diameter. Assuming all energy of t

A sensor is exposed for time t to a lamp of power P placed at a distance l. The sensor has an opening that is 4d in diameter. Assuming all energy of t
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A sensor is exposed for time t to a lamp of power P placed at a distance l. The sensor has an opening that is 4d ... N=(P lambda d^(2) t)/(hc l^(2))`
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