Advertisements
Advertisements
प्रश्न
A charged particle oscillates about its mean equilibrium position with a frequency of 109 Hz. What is the frequency of the electromagnetic waves produced by the oscillator?
उत्तर
We know that an accelerated or vibrating charged particle produces a vibrating electric field. This electric field produces a vibrating magnetic field. Both these fields together produce electromagnetic waves whose frequency is equal to the frequency of oscillation of the vibrating particle.
Frequency of waves v = 109 Hz
APPEARS IN
संबंधित प्रश्न
Draw a schematic sketch of the electromagnetic waves propagating along the + x-axis. Indicate the directions of the electric and magnetic fields
An em wave exerts pressure on the surface on which it is incident. Justify.
Suppose that the electric field amplitude of an electromagnetic wave is E0 = 120 N/C and that its frequency is v = 50.0 MHz.
- Determine B0, ω, k, and λ.
- Find expressions for E and B.
Identify the electromagnetic waves whose wavelengths vary as:
(a) 10–12 m < λ < 10–8 m
(b) 10–3 m < λ < 10–1 m
Write one use for each.
How does oscillating charge produce electromagnetic waves?
A laser beam has intensity 2.5 × 1014 W m−2. Find amplitudes of electric and magnetic fields in the beam.
Consider an oscillator which has a charged particle oscillating about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is ______.
Which one of them is used to produce a propagating electromagnetic wave?
Let E = E0 sin[106 x -ωt] be the electric field of plane electromagnetic wave, the value of ω is ______.
What is displacement current?
Give two uses of IR radiation.
Why are e.m. waves non-mechanical?
Write a short note on the radio waves.
Explain the types of absorption spectrum.
Which of the following electromagnetic radiations has the smallest wave length?
An infinitely long thin wire carrying a uniform linear static charge density λ is placed along the z-axis (figure). The wire is set into motion along its length with a uniform velocity `v = vhatk_z`. Calculate the poynting vector `S = 1/mu_0 (E xx B)`.
The electric field in a plane electromagnetic wave is given by `vecE = 200cos[((0.5 xx 10^3)/m)x - (1.5 xx 10^11 "rad"/s xx t)]V/mhatj`. If the wave falls normally on a perfectly reflecting surface having an area of 100 cm2. If the radiation pressure exerted by the E.M. wave on the surface during a 10-minute exposure is `x/10^9 N/m^2`. Find the value of x.
A plane electromagnetic wave travels in free space along the x-direction. The electric field component of the wave at a particular point of space and time is E = 6 Vm-1 along the y-direction. Its corresponding magnetic field component, B would be ______.
Name the electromagnetic wave/radiation which is used to study crystal structure.