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     Reflection of Sound The bouncing back of the sound wave on striking a surface such as wall, metal sheet, plywood, etc. is called the reflection of the sound wave. Sound bounces back a solid or a liquid like a rubber ball bounces back a wall. Sound gets reflected at the surface of a solid or liquid. Like light, it follows the laws of reflection. The direction in which sound is incident and is reflected make equal angels with the normal to the reflecting surface at the point of incidence. All three are in the same plane surface. An obstacle of large size which may be polished or rough is needed for the reflection of sound waves. Audible sound has a wide frequency range that is from 20 Hz to 17000 Hz. And also has a wide range of frequency that is from 20 mm to 17 m. so, the overall nature of the reflection varies according to the texture and structure of the surface. The reflection of sound can affect the acoustic space. In acoustics, reflection causes echoes and is

  Speed of sound in different media   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. Thus, we can say that the speed of sound with a speed which is much less than the speed of light. The speed of sound depends on the type and properties of the medium through which it travels. The speed of sound in a particular medium depends on temperature and pressure of that medium. The speed of sound decreases when we go from solid to gaseous state. In any medium as we increase the temperature, the speed of the sound increases. For example, the speed of sound in air is 331 ms -1   at 22 0 C.           and 344 ms -1 at 22 0 C. the speed of sound at a particular temperature in various media are listed below:--                  Speed of sound in different media at 25 0 C State Substance Speed in m/s Solids Aluminium 6420

  Characteristics of a sound wave   There are many characteristics of sound wave. (1)          Frequency (2)          Speed (3)          amplitude     Distinguish between loudness and intensity of sound   (1)          Loudness is a measure of the response of the ear to the sound.   Intensity is the amount of sound energy passing each second through unit area. (2)          Loudness is measured in decibels (db). Whereas intensity is measured in watt per meter square (W/m 2 ). (3)          Loudness is a subjective quantity. Intensity is an objective quantity. (4)          Loudness depends on Amplitude. Intensity depends on the Frequency and the Amplitude of the sound. (5)          In the Loudness , if the Amplitude is high, the loudness will be high. The sound intensity is directly proportional to the square of the amplitude of sound wave. (6)          Loudness is dependent on the sensitivity of the human ears. The intensity is independent

  Sound waves are longitudinal waves   Longitudinal waves are waves in which the vibration of the medium is parallel or along to the direction the waves travels and displacement of the medium is the same or the opposite direction of the wave propagation. In the sound waves, the particles of the medium vibrate in the direction parallel to the direction of propagation of disturbances. Hence, the sound waves are also called as longitudinal waves. Take an example:- Take a slinky and hold the slinky from both sides and stretch the slinky. When we compress one end of the slinky and release it, it experiences a wave of the compression which travels to the length of it, stretching follows it. The coil of the slinky has a point that moves with the waves and returns from the same path. While returning, it passes from the neutral position and then again reverse its position. If we mark a dot on the slinky, we will find that the dot on the slinky will move back and forth parallel to the

Explain how sound is produced by your school bell. When the sound waves travel through the material medium, then the particles of the medium undergo compression and rarefaction. When the vibrating object moves forward , it pushes and compresses the air in front of it creating a region of high pressure. This region is called as compression. When t he vibrating object moves backwards , it creates a region of low pressure called rarefaction . Here, the school bell consists of a hammer and gong is connected to an external source of the current. When the school bell is hit with a hammer, the hammer hits the gong continuously that causes compression and rarefaction in the air. These vibrations travel in the air in the form it starts vibrating(moves backward and forward), a series of compressions and rarefactions is created in the air and    these makes the sound waves propagate through the medium   as a result sound is produced in the school bell.           Question:-- How doe

  Propagation of sound   The sound is produced by the to and fro movement of an object which is also called as vibrations. The substances or matter through which sound is transmitted is called as medium. These medium can be solid, liquid or gas.   The sound waves consist of the particles of the medium through which it travels. A sound is a form of energy which is transmitted in the form of the sound waves. Sound moves through the medium from the point of generation to the listener. When the object gets vibrates, then the air which is surrounding their also vibrates and sound waves are carried. When there is no medium, then vibration in an object will not travel through them. When an object get vibrates, the particles of the surrounding of the medium also vibrates. The particles do not travel all the way from the vibrating object to the ear. When the particle of the medium is contact with the vibrating object, the particle is first displaced from its equilibrium position. It then