Solution:Given,Speed of sound, v = 346 m s–1Time taken for hearing the echo,t = 2 sDistance travelled by the sound= v × t = 346 m s–1 × 2 s = 692 mIn 2 s sound has to travel twice thedistance between the cliff and the person. Hence, the distance betweenthe cliff and the person …
A sound created in a big hall will persist by repeated reflection from the walls until it is reduced to a value where it is no longeraudible. The repeated reflection that results in this persistence of sound is called reverberation. In an auditorium or big hall excessive reverberation is highly undesirable.To reduce reverberation, the roof …
If we shout or clap near a suitable reflecting object such as a tall building or a mountain,we will hear the same sound again a little later. This sound which we hear is called an echo. The sensation of sound persists in our brain for about 0.1 s. To hear a distinct echo the time …
Sound bounces off a solid or a liquid like a rubber ball bounces off a wall. Like light, sound gets reflected at the surface of a solid or liquidand follows the same laws of reflection as you have studied in earlier classes. The directions in which the sound is incident and is reflected make equal …
Sound propagates through a medium at a finite speed. The sound of a thunder is heard a little later than the flash of light is seen. So, we can make out that sound travels with a speed which is much less than the speed of light. The speed of sound depends on the properties of …
Sonic boom: When the speed of any object exceeds the speed of sound it is said to be travelling at supersonic speed. Bullets, jet aircrafts etc. often travel at supersonic speeds. When a sound, producing source moves with a speed higher than that of sound, it produces shock waves in air.These shock waves carry a …
Solution:Given,Frequency, ν = 2 kHz = 2000 HzWavelength, λ = 35 cm = 0.35 mWe know that speed, v of the wave= wavelength × frequencyv = λ ν= 0.35 m × 2000 Hz = 700 m/s The time taken by the wave to travel adistance, d of 1.5 km is t = d / v …
Characteristics of a sound wave Sound waves have following characteristics:(1) Amplitude(2) wavelength(3) Frequency(4) Time period (5)Velocity Amplitude. The maximum displacement of each particle from its mean position is called amplitude.It is denoted by A.Its SI unit is metre (m). Its CGS unit is Centimeter (cm) Wavelength The distance between two nearest (adjacent) crests or troughs of a wave is called …
The regions where the coils become closer are called compressions (C) and the regions where the coils are further apart are calledrarefactions (R). As we already know, sound propagates in the medium as a series of compressions and rarefactions. Now, we can compare the propagation of disturbance in a slinky with the sound propagation in …
Sound is a mechanical wave and needs a material medium like air, water, steel etc. for its propagation. It cannot travel throughvacuum, which can be demonstrated by the following experiment. Take an electric bell and an airtight glass bell jar. The electric bell is suspended inside the airtight bell jar. The bell jar is connected …
