Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > In a waveguide, which of the following condit...
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In a waveguide, which of the following condition is true always?
- a)phase velocity = c
- b)group velocity = c
- c)phase velocity > c
- d)phase velocity < c
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
In a waveguide, which of the following condition is true always?a)phas...
Answer: c
Explanation: The phase velocity is always greater than the speed of light in waveguides. This implies the group velocity is small.
Explanation: The phase velocity is always greater than the speed of light in waveguides. This implies the group velocity is small.
Most Upvoted Answer
In a waveguide, which of the following condition is true always?a)phas...
= group velocity.
This condition is known as the dispersion relation and is true for all types of waves propagating in a waveguide, whether they are electromagnetic waves or acoustic waves. It is a consequence of the fact that the speed at which a wave travels through a medium, known as the phase velocity, depends on the wavelength of the wave, while the speed at which energy is transported by the wave, known as the group velocity, depends on the frequency of the wave. In a waveguide, the geometry of the structure constrains the possible wavelengths and frequencies of the waves that can propagate, leading to the phase and group velocities being equal.
This condition is known as the dispersion relation and is true for all types of waves propagating in a waveguide, whether they are electromagnetic waves or acoustic waves. It is a consequence of the fact that the speed at which a wave travels through a medium, known as the phase velocity, depends on the wavelength of the wave, while the speed at which energy is transported by the wave, known as the group velocity, depends on the frequency of the wave. In a waveguide, the geometry of the structure constrains the possible wavelengths and frequencies of the waves that can propagate, leading to the phase and group velocities being equal.
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In a waveguide, which of the following condition is true always?a)phase velocity = cb)group velocity = cc)phase velocity > cd)phase velocity < cCorrect answer is option 'C'. Can you explain this answer?
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