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Through how a lot will the sound point lessen if the observer strikes to a distance of 20 m? (A)   1 dB (B)   2 dB (C)   10 dB (D)   18 dB (E)   20 dB 10. An organ pipe that’s closed at one finish has a size of 17 cm. If the rate of sound in the course of the air within is 340 m/s, what's the pipe’s basic frequency? (A)   250 Hz (B)   500 Hz (C)   1000 Hz (D)   1500 Hz (E)   2000 Hz eleven. A bat emits a forty kHz “chirp” with a wavelength of eight. seventy five mm towards a tree and gets an echo zero. four s later. How some distance is the bat from the tree? (A)   35 m (B)   70 m (C)   105 m (D)   140 m (E)   175 m 12. A motor vehicle is touring at 20 m/s clear of a desk bound observer. If the car’s horn emits a frequency of six hundred Hz, what frequency will the observer pay attention? (Use v = 340 m/s for the rate of sound. ) (A)   (34/36)(600 Hz) (B)   (34/32)(600 Hz) (C)   (36/34)(600 Hz) (D)   (32/34)(600 Hz) (E)   (32/36)(600 Hz) part II: unfastened reaction 1. A rope is stretched among vertical helps. The issues the place it’s connected (P and Q) are fastened. The linear density of the rope, µ, is zero. four kg/m, and the rate of a transverse wave at the rope is 12 m/s. (a)   What’s the strain within the rope? (b)   With what frequency needs to the rope vibrate to create a touring wave with a wavelength of two m? The rope can help status waves of lengths four m and three. 2 m, whose harmonic numbers are consecutive integers. (c)   Find (i) the size of the rope; (ii) the mass of the rope. (d)   What is the harmonic variety of the four m status wave? (e)   On the diagram above, draw a caricature of the four m status wave, labeling the nodes and antinodes. 2. For a physics lab test at the Doppler impression, scholars are delivered to a racetrack. A vehicle is equipped with a horn that emits a tone with a continuing frequency of 500 Hz, and the objective of the test is for the scholars to monitor the pitch (frequency) of the car’s horn. (a)   If the automobile drives at 50 m/s at once clear of the scholars (who stay at rest), what frequency will they listen? (Note: velocity of sound = 345 m/s) (b)   Would it make a distinction if the automobile remained desk bound and the scholars have been pushed in a separate motor vehicle at 50 m/s clear of the auto? the next diagram exhibits an extended directly song alongside which the automobile is pushed. the scholars stand forty m from the tune. because the vehicle drives via, the frequency which the scholars listen, f′, is said to the automobile horn’s frequency, f, by means of the equation the place v is the rate of sound, vC is the rate of the auto (50 m/s), and θ is the attitude proven within the diagram. (c)   Find f′ whilst θ θ = 60°. (d)   Find f′ whilst θ θ = 120°. (e)   On the axes lower than, cartoon the graph of f′ as a functionality of x, the horizontal place of the automobile relative to the scholars’ situation. precis the rate of a wave is determined by the medium during which it travels. velocity could be made up our minds via v = fλ the place f is the frequency (f = ) and λ is the wavelength. simply because f = , the rate can be written v = . altering anyone of the interval, the frequency, or the wavelength of a wave will have an effect on the opposite amounts, yet won't impact the rate so long as the wave remains within the comparable medium.

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