Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source is 2.5 x 10¹⁵, calculate the energy of the source.

Solution

Frequency = $fraction numerator 1 over denominator 2 cross times 10 to the power of negative 9 end exponent straight s end fraction space equals 0.5 space cross times space 10 to the power of 9 straight s to the power of negative 1 end exponent$
Energy = nhv
$equals left parenthesis 2.5 space cross times space 10 to the power of 5 right parenthesis thin space left parenthesis 6.626 space cross times 10 to the power of negative 34 end exponent Js right parenthesis space left parenthesis 0.5 cross times 10 to the power of 9 straight s to the power of negative 1 end exponent right parenthesis equals space 8.28 space cross times space 10 to the power of negative 10 end exponent straight J$

Some More Questions From Structure of Atom Chapter

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Structure Of Atom

Some More Questions From Structure of Atom Chapter

What are α-particles?

Why were neutrons discovered very late?

What are the fundamental particles present in a neutral atom having atomic number greater than 1?

Do protons and neutrons have identical mass?

When α-particles are sent through a thin metal foil, most of them go straight through the foil. What inference do you draw from it?

What did Rutherford's experiment on scattering of particles show for the first time?

What is Plum-Pudding model of the atom?

Are neutrons present in all atoms?

Why are electrons called planetary electrons?

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