Tag: time period, frequency and amplitude of sound

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Questions Related to time period, frequency and amplitude of sound

Multiple choice physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

An oscillator is producing FM waves of frequency 2kHz with avariation of 10kHz. The modulating index=?

  1. 0.20

  2. 5.0

  3. 0.67

  4. 1.5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Modulation Index , $m _f=\dfrac{\text{Maximum frequency deviation}}{\text{Modulating frequency}}$

$\Rightarrow m _f= \dfrac{10 kHz}{2 kHz}$
$\Rightarrow m _f=5$

Multiple choice physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

Which one of the following will take place when a watch based on oscillating spring is taken to a deep mine?

  1. It will indicate the same time  on earth

  2. It will become fast

  3. It will become slow

  4. It will stop working
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A watch based on an oscillating spring (like a balance wheel watch) has a period T = 2*pi*sqrt(m/k). This period depends only on the mass and the spring constant, neither of which changes with gravity or depth. Thus, it keeps the same time.

Multiple choice physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

A simple harmonic oscillator of angular frequency 2 rad $s^{-1}$ is acted upon by an external force $F= sin tN.$ If the oscillator is at rest in its equilibrium position at t=0, its position at later times is proportional to 

  1. $ sin t+ \frac{1}{2}cos 2t$

  2. $ cos t -\frac{1}{2}sin2t$

  3. $sint -\frac{1}{2}sin2t$

  4. $sin t +\frac{1}{2}sin 2t$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The solution contains term proportional to $sin t$, $sin 2t$ & the only option consistent with initial conditions is (C)