Qualities of Sound

Write a short note on pitch.

What are the units of intensity and loudness of sound

What is the relation between intensity and loudness of a sound

The relation between amplitude of a wave and its intensity is

Define relationship between intensity and loudness of sound

Pitch of sound is related to its

 For any sound to possess timbre, it must have:

A sound level meter placed in front of the loudspeaker of a $60 \mathrm{W}$ and audio system reads $70 dB.$ All else being equal, when placed in front of $120 \mathrm{W}$ system, the meter will read ('x' in dB). Write $\frac{x+7}{10}$ as your answer. (x is in nearest integer and ${\log }_{10}2=0.30$ ).

Select the loudness of whisper.

If two sound waves, $y_1=0.3\sin 596\pi \left[t-\frac{x}{330}\right]$ and $y_2=0.5\sin 604\pi \left[t-\frac{x}{330}\right]$ are superimposed, the ratio of maximum and minimum intensities of beats is?

A sound source emits sound waves in a uniform medium. If the energy density is $E$ and the maximum speed of the particles of the medium is $v_{\max }$. The plot between $E$ and $v_{\max }$ is best represented by

The sound level near a noisy air conditioner is $70 \mathrm{dB}$. If two such units operate side by side, the sound level near them would be

A dog is barking at the rate $4\pi \mu W.$ Sound level at a point $10 \mathrm{m}$ away from the dog is

At $120 dB$ sound level intensity of sound is $1 \mathrm{W}/{\mathrm{m}}^2.$ Now at sound level $121 dB$ intensity will be-

If pressure amplitude in a sound wave is changed from $P_o$ to $3P_o$. The percentage increase in the intensity of wave is

Select the correct statment about the two mechanical waves, $y_1=2 \sin 2\mathrm{\pi } \left(50\mathrm{t}-2\mathrm{x}\right)$ and $y_2=4\sin 2\mathrm{\pi } \left(\mathrm{ax} +100 \mathrm{t}\right)$, propagate in a medium with the same speed. 

A small speaker delivers $3 \mathrm{W}$ of audio output. The distance from the speaker where one can detect $120 \mathrm{dB}$ intensity sound is $\alpha$. Write the value of $100\alpha$ (in $\mathrm{m}$).

[Given reference intensity of sound as $\left.{10}^{-12} \mathrm{W} {\mathrm{m}}^{-2}\right]$
$\left(\text{ Take }\frac{3}{\pi }=0.96\text{, }\sqrt{0.96}=0.98\right)$

An audio output  of a speaker is 2W  . At what distance from the speaker will one detect $120\mathrm{dB}$ intensity sound? [Given reference intensity of sound as $\left.{10}^{-12}\mathrm{W}/{\mathrm{m}}^2\right]$

The intensity of a sound wave pulse travelling along a communication channel decreases exponentially with distance $x$ according to the relation $I=I_0{e}^{-ax}$ , where $I_0$ is the intensity at $x=0$ and $\alpha$ is the attenuation constant. The attenuation in $dB/\mathrm{km}$ in which the intensity falls by $50$ percent over a distance of $50 \mathrm{km}$ is :

The displacement-time graphs for two sound waves $\mathrm{A}$ and $\mathrm{B}$ are shown in the figure, then the ratio of their intensities $\frac{I_A}{I_B}$ is equal to