Advertisements
Advertisements
प्रश्न
Which segment of electromagnetic waves has highest frequency? How are these waves produced? Give one use of these waves.
उत्तर
Gamma ray has the highest frequency in the electromagnetic waves. These rays are of the nuclear origin and are produced in the disintegration of radioactive atomic nuclei and in the decay of certain subatomic particles. They are used in the treatment of cancer and tumours.
APPEARS IN
संबंधित प्रश्न
Which mode of propagation is used by short wave broadcast serves?
Why is the amount of the momentum transferred by the em waves incident on the surface so small ?
How are the magnitudes of the electric and magnetic fields related to velocity of the em wave?
Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor
(a) increases
(b) decreases
(c) does not change
(d) is zero
Consider the situation of the previous problem. Define displacement resistance Rd = V/idof the space between the plates, where V is the potential difference between the plates and id is the displacement current. Show that Rd varies with time as `R_d = R(e^(t"/"tau) - 1)` .
Explain the types of absorption spectrum.
Which one of the following does not represent simple harmonic motion? Here y denotes the instantaneous displacement. Here, A and B are constants and co is the angular frequency.
An EM wave radiates outwards from a dipole antenna, with E0 as the amplitude of its electric field vector. The electric field E0 which transports significant energy from the source falls off as ______.
A plane EM wave travelling along z direction is described by `E = E_0 sin (kz - ωt)hati` and `B = B_0 sin (kz - ωt)hatj`. show that
- The average energy density of the wave is given by `u_(av) = 1/4 ε_0E_0^2 + 1/4 B_0^2/mu_0`.
- The time averaged intensity of the wave is given by `I_(av) = 1/2 cε_0 E_0^2`.
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 ______.
