There is a long linear source of sound whose power is $P$ and length is $L$. At point$A$, sound level is $80$ $dB$ .Then at point $B$ sound level will be .... $dB$
Advanced
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1A string fixed at both ends vibrates in three loops. The wave length is $10\, cm$ . The length of string is .... $cm$View Solution
- 2Two waves are represented byView Solution
$y_1=5 \sin 2 \pi(75 t-0.25 x)$
$y_2=10 \sin 2 \pi(150 t-0.50 x)$
The intensity ratio $\frac{I_1}{I_2}$ of the two waves is
- 3The equation of progressive wave is $y = a\sin (200\,t - x)$. where $x$ is in meter and $t$ is in second. The velocity of wave is ..... $m/sec$View Solution
- 4A standing wave exists in a string of length $150\ cm$ , which is fixed at both ends with rigid supports . The displacement amplitude of a point at a distance of $10\ cm$ from one of the ends is $5\sqrt 3\ mm$ . The nearest distance between the two points, within the same loop and havin displacment amplitude equal to $5\sqrt 3\ mm$ is $10\ cm$ . Find the maximum displacement amplitude of the particles in the string .... $mm$View Solution
- 5A source of sound $S$ of frequency $500 Hz$ situated between a stationary observer $O$ and a wall $W$, moves towards the wall with a speed of $2 m/s$. If the velocity of sound is $332 m/s$, then the number of beats per second heard by the observer is (approximately)View Solution
- 6A hearing test is conducted on an aged person. It is found that her thresold of hearing is $20 \,dB$ at $1 \,kHz$ and it rises linearly with frequency to $60 \,dB$ at $9 \,kHz$. The minimum intensity of sound that the person can hear at $5 \,kHz$ isView Solution
- 7A tuning fork vibrating with a sonometer having $20 cm$ wire produces $5$ beats per second. The beat frequency does not change if the length of the wire is changed to $21 cm.$ the frequency of the tuning fork (in Hertz) must beView Solution
- 8The particle displacement of a travelling longitudional wave is represented by $\xi = \xi (x,t)$. The midpoints of a compression zone and an adjacent rarefaction zone are represented by the letter ‘$C’$ and $‘R’$. Which of the following is true?View Solution
- 9View SolutionWhen a stationary wave is formed then its frequency is
- 10In an experiment to measure the speed of sound by a resonating air column, a tuning fork of frequency $500 Hz$ is used. The length of the air column is varied by changing the level of water in the resonance tube. Two successive resonances are heard at air columns of length $50.7 cm$ and $83.9 cm$. Which of the following statements is (are) true?View Solution
$(A)$ The speed of sound determined from this experiment is $332 m s ^{-1}$
$(B)$ The end correction in this experiment is $0.9 cm$
$(C)$ The wavelength of the sound wave is $66.4 cm$
$(D)$ The resonance at $50.7 cm$ corresponds to the fundamental harmonic