Question

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

Answer #1

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 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
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...

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 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 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?

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

1. A laser produces a beam of light with a circular
cross-section with a radius of 2.0 mm. If the peak electric field
(the electric field amplitude) in the beam is 2300 V/m, then what
is the total power delivered by the laser?
2. In a series RLC circuit, suppose R = 300 W, L = 60
mH, C = 0.50 µF, and source voltage is Vs = (15 V)cos(20000?t).
Find (a) voltage amplitudes across R, L, and C respectively, (b)...

A helium–neon laser produces a beam of diameter 1.75 mm,
delivering 2.25 1018 photons/s. Each photon has a wavelength of 633
nm.
(a) Calculate the amplitude of the electric field inside the
beam.
_____________ kV/m
(b) Calculate the amplitude of the magnetic field inside the
beam.
______________µT
(c) If the beam shines perpendicularly onto a perfectly
reflecting surface, what force does it exert on the surface?
______________nN
(d) If the beam is absorbed by a block of ice at 0°C...

A helium–neon laser produces a beam of diameter 1.75 mm,
delivering 1.95 1018 photons/s. Each photon
has a wavelength of 633 nm.
(a) Calculate the amplitude of the electric field inside the
beam.
kV/m?
(b) Calculate the amplitude of the magnetic field inside the
beam.
µT?
(c) If the beam shines perpendicularly onto a perfectly reflecting
surface, what force does it exert on the surface
nN ?
(d) If the beam is absorbed by a block of ice at 0°C for...

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