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Questions and Answers
What is the equation of a plane progressive electromagnetic wave?
What is the equation of a plane progressive electromagnetic wave?
- $E_n = E_0 \cos (ckz - \omega t)$, $B_y = B_0 \cos (ckz - \omega t)$
- $E_n = -E_0 \sin (ckz - \omega t)$, $B_y = B_0 \sin (ckz - \omega t)$ (correct)
- $E_n = -E_0 \cos (ckz + \omega t)$, $B_y = -B_0 \cos (ckz + \omega t)$
- $E_n = E_0 \sin (ckz + \omega t)$, $B_y = B_0 \sin (ckz + \omega t)$
What is the frequency range for TV waves as mentioned in the text?
What is the frequency range for TV waves as mentioned in the text?
- 30MHz to 300MHz
- 900kHz to 1800kHz
- 530kHz to 1710kHz
- 54MHz to 890MHz (correct)
What type of modulation uses radio waves in the range from 530kHz to 1710kHz?
What type of modulation uses radio waves in the range from 530kHz to 1710kHz?
- Amplitude Modulation (AM) (correct)
- $QAM$ Modulation
- Phase Modulation (PM)
- Frequency Modulation (FM)
What is the relationship between the frequency of an electromagnetic wave and the frequency of oscillation of charge?
What is the relationship between the frequency of an electromagnetic wave and the frequency of oscillation of charge?
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What is the speed at which electromagnetic waves propagate through space, according to the text?
What is the speed at which electromagnetic waves propagate through space, according to the text?
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Study Notes
Electromagnetic Waves
- The equation of a plane progressive electromagnetic wave is E(x, t) = E0sin(kx - ωt), where E0 is the amplitude, k is the wave number, and ω is the angular frequency.
Frequency Range of TV Waves
- The frequency range for TV waves is from 50MHz to 220MHz.
Modulation
- Amplitude Modulation (AM) uses radio waves in the range from 530kHz to 1710kHz.
Frequency and Oscillation of Charge
- The frequency of an electromagnetic wave is equal to the frequency of oscillation of charge.
Speed of Electromagnetic Waves
- Electromagnetic waves propagate through space at a speed of 3.0 x 10^8 m/s, which is the speed of light.
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