Decibel is unit of
Easy
Download our app for free and get started
Decibel $(dB)$, unit for expressing the ratio between two physical quantities, usually amounts of acoustic or electric power, or for measuring the relative loudness of sounds
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
- 1View SolutionIn a harmonium the intermediate notes between a note and its octave form
- 2Two trains are moving towards each other at speeds of $20 m/s$ and $15 m/s$ relative to the ground. The first train sounds a whistle of frequency $600 Hz.$ the frequency of the whistle heard by a passenger in the second train before the train meets is ...... $Hz$ (the speed of sound in air is $340\, m/s$)View Solution
- 3A whistle $S$ of frequency $f$ revolves in a circle of radius $R$ at a constant speed $v$. What is the ratio of largest and smallest frequency detected by a detector $D$ at rest at a distance $2R$ from the centre of circle as shown in figure ? (take $c$ as speed of sound)View Solution
- 4A narrow tube is bent in the form of a circle of radius $R,$ as shown in the figure. Two small holes $S$ and $D$ are made in the tube at the positions right angle to each other. A source placed at $S$ generated a wave of intensity $I_0$ which is equally divided into two parts : One part travels along the longer path, while the other travels along the shorter path. Both the part waves meet at the point $D$ where a detector is placed If the minima is formed at the detector then, the magnitude of wavelength $\lambda$ of the wave produced is given byView Solution
- 5A source of sound $S$ is moving with the velocity of $50\,m/s$ towards a stationary observer. The observer measures the frequency of the sound as $1000\,Hz.$ What will be the apparent frequency of the source when it is moving away from the observer after crossing him ... $Hz$ ? (Take velocity of sound in air is $350\,m/s$ )View Solution
- 6A hollow pipe of length $0.8 \mathrm{~m}$ is closed at one end. At its open end a $0.5 \mathrm{~m}$ long uniform string is vibrating in its second harmonic and it resonates with the fundamental frequency of the pipe. If the tension in the wire is $50 \mathrm{~N}$ and the speed of sound is $320 \mathrm{~ms}^{-1}$, the mass of the string isView Solution
- 7In the resonance tube experiment, first resonant length is $l_1$ and second resonant length is $l_2$ then the third resonant length will beView Solution
- 8The string of a violin has a frequency of $440 \,cps$. If the violin string is shortened by one fifth, its frequency will be changed to ........... $cps$View Solution
- 9A source is moving towards an observer with a speed of $20 m/s$ and having frequency of $240 Hz.$ The observer is now moving towards the source with a speed of $20 m/s$. Apparent frequency heard by observer, if velocity of sound is $340 m/s$, is ... $Hz$View Solution
- 10Two pulses in a stretched string whose centres are initially $8 cm$ apart are moving towards each other as shown in the figure. The speed of each pulse is $2 cm/s$. After $2$ seconds, the total energy of the pulses will beView Solution
