Question

A 8.2 mW laser produces a narrow beam of light. How much energy is contained in a 2.5 m length of its beam? Express your answer using two significant figures.

Answer #1

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A 0.50 mW laser produces a beam of light with a diameter of 1.6
mm . Part A What is the average intensity of this beam? Part B At
what distance does a 130 W lightbulb have the same average
intensity as that found for the laser beam in part (a)? (Assume
that 5.0% of the bulb's power is converted to light.) Express your
answer using two significant figures.

A parallel beam of light from a He-Ne laser, with a wavelength
633 nm, falls on two very narrow slits 0.066 mm apart.
Part A
How far apart are the fringes in the center of the pattern on a
screen 4.1 m away?
Express your answer to two significant figures and include the
appropriate units.

A 0.64-mW laser produces a beam of light with a diameter of 2.9
mm. (a) What is the average intensity of this beam? W/m2 (b) At
what distance does a 150-W light bulb have the same average
intensity as that found for the laser beam in part (a)? (Assume
that 5.0% of the bulb's power is converted to light.) cm

A 12.7 mW laser puts out a narrow beam 1.50 mm in diameter. What
are the average (rms) values of E and B in the
beam?
E =
______V/m
B =
_______T

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 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 high-energy pulsed laser emits a 1.0-ns-long pulse of average
power 8.3×1011 W . The beam is 1.1×10?3m in radius.
Part A
Determine the energy delivered in each pulse.
Express your answer using two significant figures.
E =......?...... J
Part B
Determine the rms value of the electric field.
Express your answer using two significant figures
Erms = .....?...... V/m

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 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.

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