Physics question and answers for March 15, 2024
- Q A table is revolving on its axis at 5 revolutions per second A sound source of frequency 1000 Hz is fixed on the table at 70 cm from the axis...
- Q Hz A source of sound of frequency f is placed on the ground A detector placed at 2 x 10 fi a height is released from rest on this source...
- Q The sound from a trumpet is emitted uniformly in all directions at 20 C At point P in space the sound intensity level is 30 dB The density of air...
- Q Two passenger trains moving with a speed of 108 km hour cross each other One of them blows a whistle whose frequency is 750 Hz If sound speed is 330...
- Q Let s try this 1 Take a small stone and a bucketful of water Drop the stone into the water from a height of about 20 cm You will hear...
- Q 3v 10 A car is moving with a velocity towards a medium MNRP as shown where v is the speed of sound in air Two men A an B are...
- Q respectively a A f c 22 f 22 4 f d Both a and c Medium I b A sound wave propagating along x axis in medium I of density...
- Q 11 A biker is moving with constant velocity v away from a long straight wall at an angle with the wall He honks a short beep of horn when he...
- Q 77 Source and observer start moving simultaneously along x and y axis respectively The speed of source is twice the speed of observer vo If the ratio of observed frequency...
- Q 1 Two sound waves emerging from a source reach a point simultaneously along two path of propagation when the path difference 55 cm the resultant intensity is zero at that...
- Q 7 A bird is singing on a tree and a man is hearing at a distance r from the bird Calculate the displacement of the man towards the bird so...
- Q Which of the following travelling wave will produc standing wave with node at x 0 whe superimposed y Asin wt kx 1 Asin wt kx 3 Acos wt kx 2...
- Q 4 A whistle emits sound waves of frequency 2000 Hz These sound waves reach a point X through two different path such that path difference is 20 cm and there...
- Q A hammer strikes one end of a thick copper rail of length 8 12 m A microphone located at the opposite end of the rail detects two pulses of sound...
- Q In expressing sound intensity we take 10 19 W m2 as the reference level For ordinary conversation the intensity level is about 106W m2 Expressed in decibel this is a...
- Q 3 The average density of Earth s crust 10 km beneath the surface is 2 7 gm cm The speed of longitudinal seismic waves at that depth is 5 4...
- Q purce S receiver R and air are moving relative to the ground as shown in the fig Vs VR Vw 20 m s and velocity of sound in still air...
- Q A person speaking normally produces a sound intensity of 40dB at distance of 1m If the threshold intensity for reasonable audibility is 20dB the maximum distance at which he can...
- Q A sound source is moving towards a stationa 1 observer with of the speed of sound The rat 10 of apparent observed by observer to real observe by someone moving...
- Q The ratio of intensities between two coherent sound source is 4 1 The difference in loudness in decibels dB between maximum and minimum intensities when they interfere in space is...
- Q Three musicians experiment with the Doppler effect Musician A rides in a car at a speed u directly away from musician B who is stationary Musician C rides in a...
- Q Suppose there are 100 point sound sources with individual speed q arranged in a 10 X 10 square array the distance between the point sound sources is a and the...
- Q A stationary source of sound is emitting wave of frequency 30 Hz towards a stationary wall There is an observer standing between the source and the wall If the wind...
- Q A police van is chasing a thief s car on a straight highway with speed of van and car are 20 m s and 10 m s respectively If van...
- Q 1 Beats are due to destructive interference X 2 Maximum beat frequency audible to a human being is 200 3 Beats are due to superposition of two wave of nearly...
- Q Calculate the speed of sound in knots at a density altitude of 20 000 feet with an ambient pressure of 932 44 lb ft2 Note use the equations provided and...
- Q Two coherent light sources P and Q are at a distance 32 from each other as shown in the figure The distance from P on the x axis at which...
- Q 7 a The mean optical power launched into an optical fiber having length a 5 km is 40 W and the mean optical power at receiver end is 4 W...
- Q By providing 15kg wt one dinometer sn d one tuning fork has been ossulated to gether A prodece 8 beatsper second If tension increased to 16kg wt then tunin g...
- Q b The signal retrieved in an optical fiber reduces at its output to one tenth of its input power What is the overall attenuation What shall be the power at...
- Q The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends The length of...
- Q A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano The beat frequency decreases to 2 beats per second when...
- Q The variation of pressure for a sound wave travelling along the positive x axis is shown below Choose the correct statements Ap A B X A Particles just on left...
- Q As shown in the figure two loudspeakers are located at points A and B Both are vibrating in phase at a frequency and P and P2 are their respective powers...
- Q On a windless day sound emanate isotropically from a point source Rays of the sound waves emanated from a point source placed close to ground are shown in the figure...
- Q Review Q The original frequency of the note produced by a sonometer is n The sonometer wire is reduced in length to half of its original value and its tension...
- Q Acoustic Power through a Window A window whose area is 2 m opens on a street where the street noise result in a sound level of 60 dB at window...
- Q Sound Velocity in an Artificial Medium In a region air pressure and volume are related as P a v where a is constant Consider air as an ideal gas of...
- Q 6 A rope of length L is clamped at both ends The standing wave is having three antinodes and four nodes Which one of the following is a possible wavelength...
- Q i A person hums in a wall and finds strong resonance at frequencies 60Hz 100Hz and 140Hz What is the fundamental frequency of the well Explain How deep is the...
- Q Create a formula for the velocity of a car that is found by radar gun in other words a formula that is solved for car Operate under the assumption that...
- Q When the same note is played on a sitar and a flute the sound produced can be distinguished from each other because of the difference in A pitch loudness and...
- Q 1 The second harmonic of an open organ pipe o length lo cm and of radius of cross section 0 5 cm is equal to first overtone of a closed...
- Q Take a long thread Place your hands over y our ears and get someone to place this thre ad round your head and hands Ask her to m ake the...
- Q B is a source of sound of frequency 650 Hz Coefficient of restitution is 1 2 and velocity of sound in air 330 ms the frequency appearing to A after...
- Q Two sitar strings A and B playing the note Dha are slightly out of tune and produce beats frequency 6 Hz The tension of string B is slightly decreased and...
- Q LLEN The velocity of sound is V in air If the density 43 of air is increased to 4 times than the new velocity of sound will be Pressure unchanged...
- Q An observer sitting in line of two s cience watches the flashes of two tanks firing at each other at the sa me time but he hear the sound of...
- Q A cylindrical tube open at both ends has fundamental frequency f in air The tube is dipped vertically in water so that half of it is in water The fundamental...
- Q The threshold of human hearing is 1 10 W m What is the sound intensity of a jet flying over at distance of 300 m with a sound intensity of...
- Q Foley sound is recorded after the film is shot O True False
- Q Two small speakers 0 600 m apart are facing in the same direction They are driven by one 657 Hz oscillator and therefore emit identical sound waves in phase with...
- Q A train is moving past a crossing where cars are waiting for it to pass While waiting the driver of the lead car becomes sleepy and res his head on...
- Q A particular person s eardrum is circular with a diameter of 7 00 mm a How much sound energy in J is delivered to an eardrum in one second at...
- Q On a bright winter s day a student notices an echo as he walks between a high school s playing field and the rear wall of its auditorium He decides...
- Q Two nearby trumpets are sounded together and a beat frequency of 4 Hz is heard If one of the trumpets sounds at a frequency of 506 Hz what are the...
- Q If we study the vibration of a pipe open at both ends which of the following statements is not true 1 Open end will be an antinode 2 Odd harmonics...
- Q A sound wave travels with a velocity of 300 m s through a gas 9 beats are produced in 3 s when two waves pass through it simultaneously If one...
- Q the average power transmitted across a given point in the string 22 A musical note of frequency 256 Hz produces plane waves in air and its amplitude is 1 0...
- Q When both source and listener approach each other with a velocity equal to half the velocity c sound the frequency of the sound as detected b the listener is frequency...
- Q A vibrating tuning fork of frequency 1000 Hz is placed near the open end of a long cylindrical tube The tube has a side opening and is also fitted with...
- Q A source S emitting sound of frequency f moves uniformly along a straight line wit a velocity u as shown The velocity of sound in the medium is v u...
- Q A The decibel level of sound in a quiet office is 100watts m a What is the corresponding sound intensity in decibels b How much more intense is this sound...
- Q 49 An organ pipe open from both end produces 5 beats per second when vibrated with a source of frequency 200 Hz The second harmonic of the same pipes produces...
- Q A source of unknown frequency gives 4 beats s when sounded with a source of known frequency 250 Hz The second harmonic of the source of unknown frequency gives five...
- Q 2 2 04 m 4 1 99 m 3 VS s 2 61 Sound wave travels with a velocity of 300 ms Q 61 af 300 ms through a gas...
- Q 23 A train moving at a speed of 220 ms 1 towards a stationary object emits a sound of frequency 1000 Hz Some of the sound reaching the object gets...
- Q 29 A resonance tube is resonated with a tuning fork of frequency 256 Hz If the length of resonating air column are 32 cm and 100 cm the end correction...
- Q A suspension bridge is to be built across valley where it is known that the wind can gust at 5 s intervals is estimated that the speed of transverse waves...
- Q 52 A whistle revolves in a circle with angular speed 20 rad s using a string of length 50 cm If the frequency of sound from the whistle is 385...
- Q A whistle of frequency 500 Hz tied to the end of string of length 1 2 m revolves at 40 m s A listener standing large distance away in the...
- Q 7 An observer is moving with speed v towards a stationary source emitting a sound wave of wavelength The change in wavelength detected by the observer is v speed of...
- Q The minimum intensity of audibility of sound is 10 12W m s and density of air 1 293kg m If the frequency of sound in 1000Hz then the corresponding amplitude...
- Q A train is moving with a constant speed 15 m s along a circular track The length of the train mak an angle 90 at the centre A siren in...
- Q In a single slit diffraction of light of wavelength A by a slit of width e the size of the central maximum on a screen at a distance bis 1...
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