# In Astronomical Observations, Signals Observed from the Distant Stars Are Generally Weak. If the Photon Detector Receives a Total of 3.15 × 10–18 J from the Radiations of 600 Nm, - Chemistry

Numerical

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

#### Solution

From the expression of energy of one photon (E),

"E" = "hc"/lambda

h = Planck’s constant

Substituting the values in the given expression of E:

"E" = ((6.626 xx 10^(-34) " Js")(3xx10^(8) ms^(-1)))/((600xx10^(-9) " m"))

Energy of one photon = 3.313 × 10–19 J

Number of photons received with 3.15 × 10–18 J energy

= (3.15 xx 10^(-18) " J")/(3.313 xx 10^(-19)" J")

= 9.5

~~10

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Chapter 2: Structure of Atom - EXERCISES [Page 72]

#### APPEARS IN

NCERT Chemistry Part 1 and 2 Class 11
Chapter 2 Structure of Atom
EXERCISES | Q 2.48 | Page 72

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