Question

A small helium-neon laser emits red visible light with a power of 5.90 mW in a beam that has a diameter of 2.10 mm .

a) What is the amplitude of the electric field of the light?

b) What is the amplitude of the magnetic field of the light?

c) What is the average energy density associated with the electric field?

d) What is the average energy density associated with the magnetic field?

e) What is the total energy contained in a 1.00-mm length of the beam?

Answer #1

A small helium-neon laser emits red visible light with a power
of 5.90 mW in a beam that has a diameter of 2.60 mm .
A)What is the amplitude of the electric field of the light?
Express your answer with the appropriate units.
B)What is the amplitude of the magnetic field of the light?
C)
What is the average energy density associated with the electric
field?
Express your answer with the appropriate units.

A small helium-neon laser emits red visible light with a power
of 3.80 mW in a beam that has a diameter of 2.70 mm.
(a) What are the amplitudes of the electric and magnetic fields
of the light?
Emax
= V/m
Bmax
= T
(b) What are the average energy densities associated with the
electric field and with the magnetic field?
uE,av
= J/m3
uB,av
= J/m3
(c) What is the total energy contained in a 1.00-m length of the
beam?
J

A small helium neon laser emits
red visible light with a power if 5.7mW in a beam that has a
diameter if 2.5mm.
a) what is E max?
b) what is B max?
c) what is the avg energy density
associated with the electric field?
d) what is the avg energy density
assciated with the magnetic field?
e) what js the total energy
contained in a 1m length of the beam?

A typical helium-neon laser found in supermarket checkout
scanners emits 633-nm-wavelength light in a 1.1-mm-diameter beam
with a power of 1.3 mW .
A) What's the amplitude of the oscillating
electric field in the laser beam?
B) What's the amplitude of the oscillating
magnetic field in the laser beam?

A 14.0-mW helium–neon laser emits a beam of circular cross
section with a diameter of 2.90 mm.
(a) Find the maximum electric field in the beam.
________kN/C
(b) What total energy is contained in a 1.00-m length of the
beam?________ pJ
(c) Find the momentum carried by a 1.00-m length of the beam.
_________kg · m/s

A 12.0-mW helium–neon laser emits a beam of circular cross
section with a diameter of 2.35 mm.
(a) Find the maximum electric field in the beam.
kN/C
(b) What total energy is contained in a 1.00-m length of the
beam?
pJ
(c) Find the momentum carried by a 1.00-m length of the beam.
kg · m/s

A typical small helium-neon laser (λ=632.8μm) has a continuous
output power of 3.00mW and a beam diameter of 2.00mm.
a. What is the average value of the electric field's amplitude
within the beam?
b. How many photons are emitted each second by the laser?

A helium-neon laser (the low power red laser often used as a
pointer in presentations) is rated at 0.15mW. If the image of the
laser is a circle of 0.25 cm in diameter, and the wavelength is 632
nm in air:
a.) Compute the intensity of light. You may assume no power loss
before it makes the circular image.
b.) Calculate the rms electric field magnitude of the light.
c.) Calculate the frequency of the light.

Assume the helium-neon lasers commonly used in student physics
laboratories have power outputs of 0.250 mW.
(a)
If such a laser beam is projected onto a circular spot 1.60 mm
in diameter, what is its intensity (in watts per meter
squared)?
W/m2
(b)
Find the peak magnetic field strength (in teslas).
T
(c)
Find the peak electric field strength (in volts per meter).
V/m

A small laser emits light at power 6.88 mW and
wavelength 441 nm. The laser beam is focused (narrowed)
until its diameter matches the 1255 nm diameter of a
sphere placed in its path. The sphere is perfectly absorbing and
has density 4.00×103kg/m3.
What is the beam intensity at the sphere's location?
Calculate the radiation pressure on the sphere.
Calculate the magnitude of the corresponding force.
Calculate the magnitude of the acceleration that force alone
would give the sphere?

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