The process of superimposing a low frequency signal on a high frequency wave is …………….
(A) detection
(B) mixing
(C) modulation
(D) attenuation
1 Answers
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If first wave of feminism was focused on Right to vote, the second wave of feminism was focused on
A) Education and health
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The relation between frequency and wavelength of electromagnetic wave
Correct option is C) λ ∝ 1/υ
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12 In a plane electromagnetic wave, the directions of electric field and magnetic field are represented by \( \hat{ k } \) and \( 2 \hat{ i }-2 \hat{ j } \), respectively. What is the unit vector along direction of propagation of the wave? (a) \( \frac{1}{\sqrt{2}}(\hat{ i }+\hat{ j }) \) (b) \( \frac{1}{\sqrt{2}}(\hat{ j }+\hat{ k }) \) (c) \( \frac{1}{\sqrt{5}}(\hat{ i }+2 \hat{ j }) \) (d) \( \frac{1}{\sqrt{5}}(2 \hat{ i }+\hat{ j }) \)
Correct answer is (a) We know that propagation wave vector ∵ \(\vec{E} = \hat{k}\) \(\vec{B} = 2\hat{i} - 2\hat{j}\) \(\vec{C} = \vec{E} \times \vec{B}\) \(\vec{C} = \begin{vmatrix} \hat{i} & \hat{j} & \hat{k} \\ 0 & 0 & 1...
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A train, standing at the outer signal of a railway station blows a whistle of frequency 400 Hz in still air. (i) What is the frequency of the whistle
Given: vs = 10 m/s, v = 340 m/s, n0 = 400 Hz Apparent frequency (n), velocity of sound (vs) in each case Formulae: i. n = n0 \((\frac{v}{v-v_s})\) ii. n = n0 \(\frac{v}{v+v_s}\) Calculation: a. As the train approaches the...
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The process of changing some characteristics of a carrier wave in accordance with the incoming signal is called …………..
Correct option is: (B) modulation
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The process of regaining of information from carries wave at the receiver is called
Correct option is: (D) demodulation
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Longitudinal wave of the following is A) light wave
C) sound wave
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If the particles of the medium vibrate along the direction of wave, then the wave is called a …………………..
Correct option is A) longitudinal
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If the particles of the medium vibrate perpendicular to the direction of wave, then the wave is called a …………………
Correct option is B) transverse
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If the wave number of the first line in the Balmer series of hydrogen atom is `1500cm^(-1)`, the wave number of the first line of the Balmer series of
Correct Answer - A `bar(v) = bar(v)_(H) xx z^(2)`
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