Question

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.

Answer #1

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 fiber laser (? =1070 nm) with output power of 300 W is being
used. The 1/e2 radius at the waist of the beam is 100 μm and is
located at the surface of a substrate.
1. If the beam is Gaussian, what is the size of the beam 10 mm
below the substrate?
2. If the beam has an M^2 value of 7.7, what is the size of the
beam 10 mm below the substrate?
3. In terms of...

On its highest power setting, a 770-watt microwave oven heats a
bowl of spaghetti. (a) Find the average intensity of the
microwaves, given they are absorbed over a circular area 23 cm in
diameter. W/m2 (b) What is the peak electric field strength of the
microwave? V/m (c) What is its peak magnetic field strength? T

The nearly parallel beam of a laser with wavelength λ = 10μm and
output power of P = 10 W has a beam diameter of d = 3 cm. It is
focused by a lens with f = 20 cm. a) How large is the beam waist w0
in the focal plane? b) The intensity distribution in this plane is
I(r) = I0 × exp[−(r/w0) 2] . What is the value of I0? c) Assume
that 10% of the laser...

What is the intensity in W/m2 of a laser beam used to burn away
cancerous tissue that, when 90.0% absorbed, puts 500 J of energy
into a circular spot 2.00 mm in diameter in 4.00 s? Remember .

A laser emits 7.91 × 1018 photons per second in a
beam of light that has a diameter of 2.82 mm and a wavelength of
514.5 nm. Determine (a) the average electric field
strength and (b) the average magnetic field
strength for the electromagnetic wave that constitutes the
beam.
please help i will rate

On its highest power setting, a microwave oven increases the
temperature of 0.440 kg of spaghetti by 45.0°C in 150 s.
(a)
What was the rate of power absorption by the spaghetti in W,
given that its specific heat is 3.76 ✕ 103 J/(kg · °C)?
W
(b)
Find the average intensity of the microwaves in W/m2, given
that they are absorbed over a circular area 24.0 cm in
diameter.
W/m2
(c)
What is the peak electric field strength of...

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)...

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...

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...

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