Question

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/m^{2}

(b)

Find the peak magnetic field strength (in teslas).

T

(c)

Find the peak electric field strength (in volts per meter).

V/m

Answer #1

4. During normal beating, the heart creates a maximum 4.9-mV
potential across 0.22 m of a person’s chest, creating a 1.00-Hz
electromagnetic wave. What is the corresponding maximum magnetic
field strength in the electromagnetic wave?
Answer to 2 decimal point precision the number of Tesla (T) in
exponential format. No units required.
5. Assume the helium-neon lasers commonly used in student
physics laboratories have power outputs of 4.2 mW. (a) If such a
laser beam is projected onto a circular...

An evil scientist’s laser beam has a power output of 0.250
W.
(a) If such a laser beam is projected onto a circular spot 3.00
mm in diameter, what is its intensity?
(b) Find the peak magnetic field strength.
(c) Find the peak electric field strength.

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

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