help@askiitians.com

1800-150-456-789

Physical Chemistry> a certain dye absorbs light of certain wa...

question mark

a certain dye absorbs light of certain wavelength and then fluorescence light of wavelength 5,000 A° assuming that under given conditions 50% of the absorbed energy is reemitted out as Fluorescence and the ratio of number of quanta emitted out to the number of quanta absorbed is 5 ratio 8 find the wavelength of absorbed light

shauryaditya yadav , 6 Years ago

Grade 11

1 Answers

Eshan

Last Activity: 6 Years ago

Dear student,

Let the absorbed wavelength be $\lambda$ . Hence incident energy= $n_1\dfrac{hc}{\lambda}$
where $n_1$ is the number of quanta absorbed.

The emitted energy is $n_2\dfrac{hc}{\lambda'}$
It is given that $\dfrac{n_2}{n_1}=\dfrac{5}{8}$
Also the emitted energy is 50% of that absorved.
Hence $\dfrac{1}{2}\times n_1\dfrac{hc}{\lambda}=n_2\dfrac{hc}{\lambda'}$
$\implies \lambda=\dfrac{4}{5}\lambda'=4000A^{\circ}$

Provide a better Answer & Earn Cool Goodies

Enter text here...

LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

Full Live Access

Study Material

Live Doubts Solving

Daily Class Assignments

Ask a Doubt

Get your questions answered by the expert for free

Enter text here...

Which of the following aqueous solutions remains neutral afterelectrolysis

physical chemistry

0 Answer Available

Last Activity: 2 Years ago

In the reaction A + 2B ⇌ 2C, if 2 moles of A, 3 moles of B and 2 moles of C are placed in a 2 L flask andthe equilibrium concentration of C is 0.5 mol/L. The equilibrium constant (KC) for the reaction is.....and please tell how you know that the reaction is going forward .. imean how to calculate the reaction quotient ???

physical chemistry

1 Answer Available

Last Activity: 2 Years ago

True or false when an electron in ground state of hydrogen atom is excited with an energy that is greayer than e2-e1 but less than e3-e1 the electron will get excited n=2

physical chemistry

1 Answer Available

Last Activity: 2 Years ago

18 19 gram mixture of na2co3 and nahco3 on heating gives 2.2 gram CO2 gas find the percent nahco3 (by mass) in mixture

physical chemistry

1 Answer Available

Last Activity: 2 Years ago

A 100 cm cube solution of sodium carbonate is prepared by dissolving 8.653 g of salt in water the density of solution is 1.0816g per ml what are the molarity and molality of the solution.

physical chemistry

1 Answer Available

Last Activity: 2 Years ago

View all Questions