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Elena-2011 [213]
3 years ago
14

How many photons are emitted per second by a He−Ne laser that emits 1.5 mW of power at a wavelength λ=632.8nm. What is the frequ

ency of the electromagnetic waves emitted by a He−Ne laser?
Physics
1 answer:
son4ous [18]3 years ago
3 0

Answer:

The frequency of the emitted EM wave by He-Ne laser is 4.74\times 10^{14} Hz

Given:

Power emitted by He-Ne laser, P = 1.5 mW = 1.5\times 10^{- 3}

Wavelength, \lambda = 632.8 nm = 632.8\times 10^{- 9} m

Solution:

Now, to calculate the frequency, \vartheta of the EM wave emitted:

Energy associated with 1 photon = Power of one photon per sec = \frac{hc}{\lambda}

Therefore, power associated with 'N' no. of photons, P = N\frac{hc}{\lambda}

where

h = 6.626\times 10^{-34} m^{2}kg/s = Planck's constant

Now,

1.5\times 10^{- 3} = N\frac{6.626\times 10^{-34}\times 3\times 10^{8})}{632.8\times 10^{- 9}}

N = 4.77\times 10^{15}

Also, we know that:

c = \vartheta \lambda

Thus

\vartheta = \frac{c}{\lambda} = \frac{3\times 10^{8}}{632.8\times 10^{- 9}}

\vartheta = 4.74\times 10^{14} Hz

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