An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency ... $\%$
AIEEE 2005, Medium
Download our app for free and get started
(b) When observer moves towards stationary source then apparent frequency
$n' = \left[ {\frac{{v + {v_O}}}{v}} \right]\,n$
$ = \left[ {\frac{{v + v/5}}{v}} \right]\,n$$ = \frac{6}{5}n = 1.2n$
Increment in frequency $ = 0.2 n$
so percentage change in frequency = $\frac{{0.2n}}{n} \times 100= 20\%. $
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
- 1The string of a violin emits a note of $205 \,Hz$ at its correct tension. The string is tightened slightly and then it produces six beats in two seconds with a tuning fork of frequency $205 Hz$. The frequency of the note emitted by the taut string is .......... $Hz$View Solution
- 2Sound wave travels with a velocity of $300\, m\, s^{-1}$ through a gas. $9\, beats$ are produced in $3\, s$ when two waves pass through it simultaneously. If one of the waves has $2\, m$ wavelength, the wavelength of the other wave is ..... $m$View Solution
- 3The intensity of sound wave while passing through an elastic medium falls down by $10\%$ as it covers one metre distance through the medium. If the initial intensity of the sound wave was $100$ decibels, its value after it has passed through $3$ metre thickness of the medium will be .... $decibel$View Solution
- 4In a wave motion $y = a\sin (kx - \omega t)$, $y$ can representView Solution
- 5View SolutionStationary waves are formed when
- 6A string on a musical instrument is $50 cm$ long and its fundamental frequency is $270 Hz$. If the desired frequency of $1000 Hz$ is to be produced, the required length of the string is .... $cm$View Solution
- 7Stationary waves are produced in $10\,m$ long stretched string. If the string Vibrates in $5$ segments and wave velocity $20\,m/s$ the frequency is ..... $Hz$View Solution
- 8View SolutionDoppler's effect will not be applicable when the velocity of sound source is
- 9If $l_1$ and $l_2$ are the lengths of air column for the first and second resonance when a tuning fork of frequency $n$ is sounded on a resonance tube, then the distance of the displacement antinode from the top end of the resonance tube is:View Solution
- 10The ratio of maximum to minimum intensity due to superposition of two waves is $\frac{{49}}{9}$ Then the ratio of the intensity of component waves is .View Solution