Advertisements
Advertisements
Question
In which directions do the electric and magnetic field vectors oscillate in an electromagnetic wave propagating along the x-axis?
Solution
The cross product of electric and magnetic field vectors i.e. `vecE × vecB` gives the direction in which the wave travels.
It is given that wave is propagating along the x-axis. This means that electric field vector is oscillating in positive y-direction and magnetic field vector in positive z-direction.
APPEARS IN
RELATED QUESTIONS
(i) Which mode of propagation is used by shortwave broadcast services having frequency range from a few MHz upto 30 MHz? Explain diagrammatically how long distance communication can be achieved by this mode.
(ii) Why is there an upper limit to frequency of waves used in this mode?
The reflected waves from an ionosphere are _____.
(a) ground waves
(b) sky waves
(c) space waves
(d) very high-frequency waves
The frequency range of 3 MHz to 30 MHz is used for ____________.
What do you mean by skip distance?
Polarization in e.m wave is caused by
The Q of a resonant transmission line is
In which frequencies range space waves are normally propagate:-
In He-Ne loser the most favourable ratio of Helium toNe on for satisfactory laser action is
Three waves A, B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication ______.
The maximum frequency for reflection of sky waves from a certain layer of the ionosphere is found to be fmax = 9(Nmax)1/2, where Nmax is the maximum electron density at that layer of the ionosphere. On a certain day, it is observed that signals of frequencies higher than 5 MHz are not received by reflection from the F1 layer of the ionosphere while signals of frequencies higher than 8 MHz are not received by reflection from the F2 layer of the ionosphere. Estimate the maximum electron densities of the F1 and F2 layers on that day.
