CBSE (Science) Class 11CBSE
Account
It's free!

Share

Books Shortlist

# Solution - Lifetimes of the Molecules in the Excited States Are Often Measured by Using Pulsed Radiation Source of Duration Nearly in the Nano Second Range Calculate the Energy of the Source - CBSE (Science) Class 11 - Chemistry

ConceptBohr'S Model for Hydrogen Atom

#### Question

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 × 1015, calculate the energy of the source.

#### Solution

v = 1/(2.0 xx 10^(9))

v = 5.0 xx 10^8 s^(-1)

Energy (E) of source = Nhν

Where,

N = number of photons emitted

h = Planck’s constant

Substituting the values in the given expression of (E):

E = (2.5 × 1015) (6.626 × 10–34 Js) (5.0 × 108 s–1)

E = 8.282 × 10–10 J

Hence, the energy of the source (E) is 8.282 × 10–10 J.

Is there an error in this question or solution?

#### APPEARS IN

NCERT Chemistry Textbook for Class 11 Part 1 (with solutions)
Chapter 2: Structure of Atom
Q: 49 | Page no. 68

#### Reference Material

Solution for question: Lifetimes of the Molecules in the Excited States Are Often Measured by Using Pulsed Radiation Source of Duration Nearly in the Nano Second Range Calculate the Energy of the Source concept: Bohr'S Model for Hydrogen Atom. For the courses CBSE (Science), CBSE (Science)
S