50 questions · timed · auto-graded
Explanation:
Velocity of the longitudinal wave is directly proportional to the density of the medium.
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Velocity of sound in liquid medium is intermediate to the velocities in solid and gas medium.
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Windows are opened in an auditorium during a speech so that more absorption of the sound takes place by outer atmosphere and no sound gets reflected back which interferes with the original sound resulting in noise (echo).So echoes are reduced.
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Vacuum is defined as the empty space in which there are no matter particles present. As sound is a mechanical wave, in order to propagate material medium is required. Sound cannot travel through vacuum as there is no particles present for vibrations to take place.
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When tuning fork is sounded by striking its one end on rubber pad then the prongs vibrate in and out and stem vibrate up and down. Hence, vibration of prongs are transverse and those of stem are longitudinal.
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The waves on the surface of the water are neither longitudinal nor transverse.The wave on the water surface is the superposition of transverse and longitudinal motions of the molecules.
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Amplitude is merely the magnitude of sound. Thus, more the amplitude, louder is the sound.
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'Infra Sound' kind of sound before the main shock wave begins. Earthquake Any sudden shaking of the ground caused by the passage of seismic waves through Earth's rocks. Earthquakes can be extremely violent or so slight that they only register on instruments.
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The frequency of a wave is not altered by crossing a boundary. The reflected pulse becomes inverted when a wave in a less dense rope is heading towards a boundary with a more dense rope. The amplitude of the incident pulse is always greater than the amplitude of the reflected pulse.
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Loudness is the strength of ear's perception of sound.
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The speed of sound wave in air is independent of its frequency.
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This is because the screams are ultrasonic (above 20,000 hertz) which the human ear cannot hear as humans can only hear the sound in the range of 20 Hz − 20,000 Hz.
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Since pitch is proportional to frequency so higher the frequency of sound, higher will be its pitch.
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Longitudinal waves, also known as l-waves, are waves in which the displacement of the medium is in the same direction as the direction of travel of the wave. Longitudinal waves are also called compressional waves or compression waves, because they produce compression and rarefaction when traveling through a medium. In longitudinal waves, the displacement of the medium is parallel to the propagation of the wave.
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Clarity of speech increases as the number of people in the hall is increased. Because of more people, the sound gets absorbed more, due to which reverberation time decreases and thus clarity of speech increases.
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The sound which is produced due to a mixture of several frequencies is called a note and it is pleasant to listen too. An octave consists of eight different note, ranging from 256Hz to 512Hz.
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There are two basic types of mechanical waves: longitudinal waves and transverse waves.
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The Compression of any object will always be depend on its speed.
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Sound waves cannot propagate through vacuum.
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Adult humans can hear from 20Hz to 20000Hz of frequency. Sound with frequency lower than 20Hz are called infrasonic, and higher than 20000Hz are called ultrasonic or supersonic which are inaudible to humans.
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Air have bulk property so it only transfers longitudinal wave. A sound wave in air propagates as a longitudinal wave, in the form of compression and rarefaction so medium particles vibrate in the direction of wave propagation.
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the number of complete vibrations per second
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Loudness of sound is proportional to the intensity and amplitude of sound. So when we turn on the volume of TV, the amplitude of sound wave increases hence, loudness of sound increases
Explanation:
Light waves, heat waves, X-rays are examples of electromagnetic waves, which do not require any medium for their propagation.
Sound waves cannot travel through a vacuum. It needs a material medium for its propagation. Sound waves can propagate only when the vibrational energy of the particles of the medium is travelling from one point to another.
Explanation:
A sitarist tries to adjust the tension in the strings as to adjust the frequency of sitar with the frequency of other musical instruments.
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Sound is produced due to the vibration of different objects. Sound travels as a longitudinal wave through a material medium. Sound travels as successive compressions and rarefactions in the medium. Sound requires a medium to travel. It travels the fastest in a solid medium because the particles in a solid medium are closely placed as compared to liquids and gases.
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Rhinoceros communicate using infrasound of as low frequency as 5Hz.
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For transverse wave, cohesion is an important property in the medium through which the wave energy can be transported. Gas does not have such a cohesion property. Hence there is no chance for transverse waves to be propagated through gas medium. So the sound propagates in a gaseous medium by longitudinal wave.
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In case of light, the waveform changes perpendicular to the relative motion. So, it is a type of transverse wave, which causes the medium to vibrate perpendicular to the wave energy .
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Slinky can produce longitudinal as well as transverse waves.
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Sitarist is adjusting frequency of the sitar string with the frequency of other musical instruments. Because if it is not done so, the sound will be unpleasent to listen.
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Longitudinal waves propagate in a medium in the form of compressions and rarefactions . When pressure becomes high , medium particles come closer and a compression is formed and due to low pressure , rarefaction is formed.
Transverse waves propagate in the form of crests and troughs.
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Sounds having frequency more than 20,000 Hz are called Ultrasonic sound. As this is above the normal hearing range for humans, we cannot hear ultrasonic sound.
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Rhinoceros can produce infrasonic sound waves.
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Curtains absorb most of the sound incident on it and hence eliminate reverberations.
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When tuning fork vibrates in the medium then it creates sound wave. This sound wave propagates and changes the medium pressure. Maximum pressure attend is called compression and lower pressure is called rarefaction.
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Frequency of a wave is characterised by the source of the wave, which produces disturbance, therefore it doesn't change. When medium is changed. So frequency will not change in water and will be same as the frequency of source.
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Transverse waves cannot propagate in a gas because there is no mechanism for driving motion perpendicular to the propagation of the wave.
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In electromagnetic waves, energy is transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels. In water waves, energy is transferred through the vibration of the water particles.
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Infrasonic waves are formed before the major shock of earthquake.
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Reverberation is the phenomenon of persistence of sound after it is stopped by surfaces such as furniture, people, walls, etc. within a closed space, causing multiple reflections. These reflections build up with each reflection and persist for a finite time and then decay gradually as they are slowly absorbed by the objects in the space enclosed.
Explanation:
Upholstered seats in cinema halls are arranged for better absorption of sound and to decrease the reverberation time.
In an auditorium or big hall excessive reverberation is highly undesirable. To reduce reverberation, the seat materials are selected on the basis of their sound absorbing properties.
Explanation:
Sound travels fastest in solids and slowest in air. Water is in between. This is because the particles in solids are closer together than the particles in liquids or gases, and the particles in liquids are closer together than the particles in gases. The tighter particles are packed in a space, they collide more frequently. This allows sound, which is simply the combined collisions of particles, to travel fastest in solids. So, to reiterate, sound travels fastest in solids, then water, and slowest in air.
Explanation:
Rhinoceros can hear infrasonic sounds.
Explanation:
Echo sounds produces by the calculation of area and no. of population in an Auditorium. Engineer’s can’t increases it, because it can be disturb the host or anyone which present in the Auditorium.