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In astronomical observations, signals ob...

In astronomical observations, signals observed from the distant stars are generally weak. If the photon detector receives a total of `3.15 xx 10^(–18) J` from the radiations of 600 nm, calculate the number of photons received by the detector.

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Energy of one photon `=hv=h c/lambda`
`=((6.626xx10^(-34)J s)(3xx10^(8)m s^(-1)))/((600xx10^(-9)m))`
`=3.313xx10^(-19)J`
Total energy received `=3.15xx10^(-8)J`
`:.` Number of photons received
`=(3.15xx10^(-18))/(3.313xx10^(-19))=9.51~~10`
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