Physics question and answers for March 12, 2024
- Q A stationary observer receives sound from two identical tuning forks one of which approaches and the other one recedes with the same speed much less than the speed of sound...
- Q A tuning fork of frequency 480 Hz is sounded on a resonance tube The first and second resonance are observed at 16 cm and 50 cm respectively The velocity of...
- Q 17 The wave function for a particle constrained to move in one dimension is shown in the graph below p 0 for x 0 and x 5 What is the...
- Q Two factories are sounding their sirens at 800 Hz A man goes from one factory to other at a speed of 2 m s The velocity of sound is 320...
- Q The walls and ceiling of an auditorium are covered with a fibrous material to O Make the auditorium fire proof O Absorb sound and prevent echoes O Give an ethnic...
- Q Figure shows a closed pipe closed at both ends of length 10 m MN is a membrane thin sheet capable of doing simple harmonic motion of amplitude 1 mm along...
- Q 2 Increases by 37 5 3 Increases by 30 5 4 Decreases by 37 5 A tuning fork of known frequency 256 Hz makes 5 beats per second with the...
- Q A car is fited with a device which produces sound of frequency 50 Hz There is no wind and speed of sound in still alr is 345 ms An observer...
- Q A car is fitted with a device which produces sound of frequency 60 Hz There is no wind and speed of sound in stil air is 345 m s 1...
- Q A source x of unknown frequency produces 8 beats with a source of 250 Hz and 12 beats with a source of 270 Hz The frequency of source x is...
- Q A 43 m long rope of mass 5 kg joins two rock climbers One climber strikes the rope and the second feels the pulse effect 1 4 second later The...
- Q Velocity of sound in medium is V If the density of the medium is doubled what will be the new velocity of sound 1 2V 3 4V 2 V 4...
- Q A train is moving with a constant speed along a circular track The engine of the train emits a sound of frequency f The frequency heard by the guard at...
- Q A tuning fork A of unknown frequency produces 5 beat s with a fork of known frequency 340 Hz When fork A is filed the beat frequency decreases to 2...
- Q The wavelengths 40 195 per second separately with a third note of fixed frequency The velocity of sound in air in m s is 1 360 m and of two...
- Q 30 A listener moves toward statio constant speed and crosses him then correct graph between apparent frequency f with time t is 1 3 f f 14 t 2 14...
- Q diagram below shows an instantaneous position of a string as a transverse progressive wave travels along it from left to right b a Which one of the following correctly shows...
- Q The input power to a device is 10 000 W at a voltage of 1000 V The output power is 500 W while the output impedance is 20 a Find...
- Q The frequencies of three tuning forks A B and C have a relation n ng nc When the forks A and B are sounded together the number of beats produced...
- Q A man standing between two cliffs claps his hands and starts hearing a series of echoes at intervals of 2 sec Since the speed of sound in air is 340...
- Q In a resonace air column experiment first and second resonances are obtained at lengths of air columns 1 and the third resonance will be obtained at a length of 1...
- Q A source of sound is travelling with a velocity of 30 m s towards a stationary observer If actual frequency of source is 1000 Hz and the wind is blowing...
- Q A train moves towards a stationary observer with speed 34 m s The train sounds a whistle and its frequency registered by the observer is f If the train s...
- Q 5 A tube closed at one end has a vibrating diaphragm at the other end which may be assumed to be a displacement node It is found that when the...
- Q A light pointer fixed to one prong of a tuning fork touches a vertical plate The fork is set vibrating and plate is allowed to fall freely 8 complete oscillations...
- Q A square hinged structure ABCD is formed with four massless rods which lies on the smooth horizontal table The hinge D of structure is fixed with table and hinge A...
- Q c 60 Two sound sources emitting sound each of wavelength are fixed at a given distance apart A listener moves with a velocity u along the line joining the two...
- Q c 60 9 Two sound sources emitting sound each of wavelength are fixed at a given distance apart A listener moves with a velocity u along the line joining the...
- Q The length of the wire shown in figure between the pulleys is 1 5 m and its mass is 12 0 g The frequency of vibration with which the wire...
- Q 21 A mixture of 2 moles of helium gas atomic mass and 1 mole of argon gas atomic mass 40 amu is kept at 4 amu 300 K in a...
- Q A sound wave is propagating through a medium and the displacement equation for the particles of the medium is given by y Ao sin kx wt then which of the...
- Q 47 A train is moving with 30 m s and speed of sound in air is 340 m s Another train is moving in opposite direction with speed 15 m...
- Q IVE NUMERICAL A stationary source emits the sound of frequency fo 492 Hz The sound is reflected by a large car approaching the source with a speed of 2 ms...
- Q The intensity of the sound wave from a jet airplane as it is taking off is 106 W m at a distance of 6 10 m A person is standing...
- Q 36 Two small speakers are separated by a distance of 5 cm as shown in Figure 33 44 The speakers are driven in phase with a sine wave signal of...
- Q A police car moving at 22 m s 1 chases a motor cycle The man in the car sounds his horn at 170 Hz while both of them move towards...
- Q 4 A police standing at a place detected a 10 change in frequency of the sound of a horn of a fast moving car approaching towards him If the velocity...
- Q A student while performing the experiment with a sonometer with bridges separated by a distance of 60 cm missed out some of the observations However he claimed that the three...
- Q A motor car is moving towards a vertical wall The driver observes that the frequency of the sound of his horn changes from 440 Hz to 480 Hz when he...
- Q Two sources separated by a certain distance are each producing a sound of frequency 1360 Hz A listener from the middle of the two sources starts moving towards a source...
- Q 3 A motor car blows a horn of frequency 1000 Hz while approaching a large reflector with a uniform velocity of 50 km h Calculate the frequency of the echo...
- Q 5 What will be the percentage difference between the frequency of the sound heard by an observer and the actual frequency of the whistle of a train approaching at a...
- Q A sound wave passing through the air at NTP produces a pressure of 0 001 dyne cm2 during a compression The corresponding change in temperature given y 1 5 and...
- Q A tuning fork produces 4 beats per second with another tuning fork of frequency 256 Hz The first one is now loaded with very little wax and number of beats...
- Q The second harmonic of an open organ pipe of length 10 cm and of radius of cross section 0 5 cm is equal to first overtone of a closed organ...
- Q 20 tuning forks are arranged in series in such a way that each fork gives 3 beats s with the previous one If the last fork is one octave lower...
- Q In a closed organ pipe of length 105 cm standing waves are set up corresponding to third overtone What distance from the closed end a pressure node is formed 1...
- Q Assume that a police siren emits sound of wavelength 2 cm If an observer moving with a speed 20 m s approaches a stationary police jeep which with its siren...
- Q 5 The ratio of intensities between two coherent sound sources is 4 1 The difference of loudness in dE between maximum and minimum intensities whe they interfere in the space...
- Q A string of length 0 4 m and mass 10 2 kg is clamped at its ends The tension in the string is 1 6 N When a pulse travels...
- Q The amplitude of a wave disturbance propagating in positive x direction is given by 1 1 1 x 1 x 1 where y and x are in meter The speed...
- Q A man stands somewhere between two cliffs When he claps his hand he hears two echoes one after 2 seconds and one after 4 seconds Taking the speed of sound...
- Q A tuning fork of frequency 400 Hz resonates with a tube closed at one end of length 20 cm and diameter 6 cm in fundamental mode The velocity of sound...
- Q If the pressure amplitude of a sound wave is increased by a factor of 4 then the average intensity increases by a factor of 8 2 hr m 4
- Q 4 vibratory string fixed at one end A tube of certain diameter and of length 48cm is open at both ends Its fundamental frequency of resonance is found to be...
- Q A source of sound is moving on a circular path with an angular speed of 4 rad s as shown The frequency of the source is 256 Hz The maximum...
- Q A car moves towards a hill with speed vc It blows a horn of frequency f which is heard by an observer following the car with speed vo The speed...
- Q O a musical instrument O the wavelength of noise O a musical note a measure of sound level
- Q A man stands somewhere between two cliffs When h claps his hand he hears two echoes one after 2 seconds and one after 4 seconds Taking the speed of sound...
- Q Consider a cylindrical tube of length 240 cm which is closed at one end It is slowly filled with water such that the height of water in the tube increases...
- Q The second harmonic of an open organ pipe of length lo cm and of radius of cross section 0 5 cm is equal to first overtone of a closed organ...
- Q A vibrating tuning fork is moving slowly and uniformly in a horizontal circular path of radius 8 m The shortest distance of an observer in same plane from the tuning...
- Q An open organ pipe 45 cm long and a closed organ pipe 38 cm long both of same diameter are each sounding their second overtone and are in unison The...
- Q In this figure shown BCD is an equilateral triangle of side length 1m A sound source of unknown frequency produce sound at A and minima is obtained at D The...
- Q of the following overtones of B is same as the fundamental frequency of A the strings are fixed at The tension length diameter and density of a string B are...
- Q 76 Wavelengths of two notes in air are 1 m and 1 1 164 Each note produces 1 beat s with a third note of a fixed frequency The speed...
- Q 27 A source of sound is moving towards a high wall with a speed of 25 m s A person moving away from the source and towards the wall with...
- Q Three musicians experiment with the 16 Doppler effect Musician A rides in a car at a speed u directly away from musician B who is stationary Musician C rides in...
- Q 39 An observer moves towards a stationary source of sound with a velocity one fifth of the velocity of sound The percentage increase in the apparent frequency is 1 5...
- Q While measuring the speed of sound by performing a resonance column experiment a student gets the first resonance condition at a column length of 18 cm during winter Repeating the...
- Q The total length of a sonometer wire between fixed ends is 110 cm Two bridges are placed to divide the length of wire in ratio 6 3 2 The tension...
- Q A laser signal sent towards the moon returns after T seconds If C is the speed of light then the distance of the moon from the observer is given by...
- Q A tuning fork with frequency 800 Hz produces resonance in a resonance column tube with upper end open and lower end closed by water surface Successive resonance are observed at...
- Q 117 In a guitar two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz When tension in B is...
- Q 114 A boy is walking away from a fixed rigid wall at a speed of 1 m s in a direction at right angles to the wall As he walks...
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