Helium Neon Laser

The wavelength of light emitted by a 4 mW helium-neon laser is 632 nm. If the diameter of the laser beam is 1.

The wavelength of light emitted by a 4 mW helium-neon laser is 632 nm. If the diameter of the laser beam is 1.8 mm, what is the density of photons in the beam?

power, P = 4 mW (im assumming its mega and not mili)

diameter = 1.88 mm

density = photons / volume

volume = (pi)r^2*L; L = c*t

energy of photon is = h*f

number of photons

= Power * t / energy of photon;

density = P*t/E / (pi(r^2)*ct)
= (P/E) / (pi(r^2)*c)

E = hf = hc/(lambda)

density = (P*lambda/h)/(pi*r^2)
= (P*lambda)/(h*pi*r^2)

sorry man im lazy to replace the numerical values into the equation above.

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Helium-Neon laser 7,2mW

Physics help with double slit problem?

Light from a helium-neon laser ( = 633nm ) is used to illuminate two narrow slits. The interference pattern is observed on a screen 2.7m behind the slits. Twelve bright fringes are seen, spanning a distance of 52mm .

What is the spacing (in ) between the slits?

Please explain on how you get the answer

Maxima occur when the path difference is an integral # of wavelengths:

dsin θ = mλ,

sin θ = y/L

d = mλ/sinθ = mλ/y/L = mλL/y = 12*633x10^-9(2.7)/52x10-³

d = 394x10^-6 m = 0.394 mm