Barcode clipart longitudinal wave3/21/2024 This means that a human can clearly hear those sound waves, which have a frequency of 20 Hz to 20,000 Hz. The audible range of hearing of a human ear is 20 Hz and 20,000 Hz. Therefore, to avoid reverberation, materials that absorb soft sound, like plant fibre, curtains, carpets, compressed fiberboard, etc., are used in such places viz auditoriums. If reverberation stays over a longer period of time, the sound gets impacted, which makes it confusing, blurred, and distorted because of the overlapping of various sounds. The persistence or repetition of sound waves for a prolonged period of time due to continuous (non-stop) reflections of sound is denoted as reverberation. This minimum distance is also dependent on the room temperature. To satisfy the above condition, the minimum distance between you and the reflecting surface must be of 17.2 meters at 22℃.The time gap between the actual sound and the reflected sound must be of 0.1 seconds, and.There are two primary conditions in order to hear a sound echo: Sounds echo when it successively gets reflected from large and hard surfaces or obstacles. When a person is able to hear back his/her own sound, then such a situation is referred to as the echoing of sound. Since sound cannot travel in a vacuum, it requires a medium that can be in the form of solid, liquid, or even gas.Īnother topic which is a part of class 9 Science Sound is Echo. The particles that are present in and around the medium causes motion in each other (and not forward or backward) that results in traveling of sound. And, the substance that helps sound travel is called the medium. Propagation of sound means traveling or movement of sound. A melodious sound from a flute is produced when its air column vibrates because of the air that passes through it. For instance, when the two vocal cords in a living being’s throat vibrate, a sound is produced, which is known as the voice of the living being. When an object vibrates or a form of energy of some outside source, such as wind, hand, etc., assists in vibrating the object, a sound is produced or made. Production, Propagation, and Medium of Sound For example, the sound produced by a ringing phone is possible when electrical energy is transformed into sound energy. A person can produce a sound by converting a form of energy into sound energy. Sound can neither be created nor destroyed. A form of energy that creates a sensation of hearing in our ears and makes us hear something is called sound.
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