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

The sounds having frequency of $20$ Hz to $20,000$ Hz are

  1. Ultrasound

  2. Infrasonics

  3. Hypersonics

  4. Audible Sounds
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the case of sound waves, having frequency in between $20$ Hz and $20,000$ Hz, called audible sound and  waves of frequency smaller than $20$ Hz are called infrasonic and waves having frequency greater then $20,000$ Hz, called Hypersonics sounds.

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

The time taken by a particle in reaching from a trough to its next crest in a transverse wave is

  1. T/4

  2. T/2

  3. T

  4. 3T/4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A crest and a trough are separated by a distance of $\lambda/2$. A distance of $\lambda/2$ corresponds to a time difference of T/2

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

The equation of motion of a particle is $x = a cos(\alpha t)^2$. The motion is

  1. periodic but not oscillatory

  2. periodic and oscillatory

  3. oscillatory but not periodic

  4. neither periodic nor oscillatory.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The motion is oscillatory but not periodic because the oscillations are followed from the maximum displacement (negative extreme) at t=0, the corresponding echo is equal to π/2

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

State whether true or false.
All periodic motion need not be oscillatory but all oscillatory motions
are periodic.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Any motion that repeats itself at regular intervals of time is periodic in
nature (e.g., motion of a planet around the sun) but it is not necessarily
oscillatory But all oscillatory motions undergo periodic repetitions hence 
are always periodic

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

If a body moves back and forth repeatedly about a mean position, it is said to possess 

  1. rotatory motion

  2. projectile motion

  3. oscillatory motion

  4. Reciprocating motion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oscillation is the process of swinging or moving to and fro in a steady, uninterrupted manner, and oscillatory motion is the movement created by the process.

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

In the equations below, A, B, $\omega$ and $\phi$ are constants; $y$ and $t$ are variables; $t$ represents time. Only one of the following equations does not represent SHM. Which one is that?

  1. $y= A sin \omega t$

  2. $y= B cos \omega t$

  3. $y= A sin \omega t + B cos \omega t$

  4. $y= A sin \omega t + B cos (2\omega t)$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A linear combination of coherent simple harmonic motions would result in another simple harmonic motion.

But the combination of two incoherent simple harmonic motions($Asin\omega t,B cos(2\omega t)$) is NOT an SHM.
Hence the answer is option D.

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 of the following is not an oscillatory motion?

  1. The tuning fork

  2. The stretched string

  3. The motion of the swing

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oscillation is a motion in which a body moves back and forth repeatedly about a mean position. Since in all the first 3 options, the motion is oscillatory, the correct option is 'None of these'.