Number of photons having wavelength 632 .8 nm, emitted by 5 mW laser source in 1 second is

Open MARKS Web Download App

Search any question & find its solution

Question: Answered & Verified by Expert

Number of photons having wavelength

632 .8 nm,

emitted by

5 mW

laser source in

1

second is

ChemistryStructure of AtomJEE Main

Options:

A $1.6 \times 1 0^{19}$
B $1.6 \times 1 0^{16}$
C $1.6 \times 1 0^{25}$
D $1.6 \times 1 0^{13}$

Solution:

2566 Upvotes Verified Answer

The correct answer is:

1.6 \times 1 0^{16}

E = \frac{n h c}{λ}

5 \times 1 0^{- 3} J / s = n \times \frac{1240}{632.8} \times 1.6 \times 1 0^{- 19} J

n = 1.6 \times 1 0^{16}

Looking for more such questions to practice?

Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.

Use on iOS or Desktop Download from Google Play