Problem 4: Radio waves travel through air at approximately the speed of light, c. Imagine your local FM radio station
Posted: Mon May 16, 2022 6:21 pm
Problem 4: Radio waves travel
through air at approximately the speed of light, c.
Imagine your local FM radio station broadcasts plane waves
travelling in the negative x-direction with a
frequency of f = 97.9 MHz. The
waveform of the electric-field component
is E(x, t)
= E0sin(Φ(x, t)),
where Φ(0, 0) = 0 and the amplitude
is E0 = 0.16 N/C.
Part (b) Calculate the value of the
electric field, in newtons per coulomb, of the wave at the
position x = -3.4 m at the
time t = 0.0085 μs.
Problem 12: The filament in a
clear incandescent light bulb radiates visible light at a power
of P. Model the glass part of the bulb as a sphere of
radius r0.
Part (b) Enter an expression for the
total amount of electromagnetic energy due to visible light inside
the bulb.
through air at approximately the speed of light, c.
Imagine your local FM radio station broadcasts plane waves
travelling in the negative x-direction with a
frequency of f = 97.9 MHz. The
waveform of the electric-field component
is E(x, t)
= E0sin(Φ(x, t)),
where Φ(0, 0) = 0 and the amplitude
is E0 = 0.16 N/C.
Part (b) Calculate the value of the
electric field, in newtons per coulomb, of the wave at the
position x = -3.4 m at the
time t = 0.0085 μs.
Problem 12: The filament in a
clear incandescent light bulb radiates visible light at a power
of P. Model the glass part of the bulb as a sphere of
radius r0.
Part (b) Enter an expression for the
total amount of electromagnetic energy due to visible light inside
the bulb.