Sound

Read the paragraph about sound and complete it with the words given in word bank. When a string of a guitar is plucked, it moves from one side to another in a back and forth motion or you can say it vibrates.When the string moves to any one side, the surrounding air particles also shift to one side. When the string moves to the other side, the surrounding particles shift in the same way.The continuously moving strings of a guitar shift the air particles in their respective directions. So, the vibrations of guitar strings set the surrounding air particles into vibrations, and this produces sound.As the vibrations of the guitar strings come to a stop, the surrounding air particles also stop vibrating and we cannot hear any more sound being produced. Study the speed of sound in different materials and identify the state to which they belong. liquid solid solid solid solid gas Sort the following materials as good absorber and reflector of sound. Good absorber cotton wool carpet curtain Good reflector brick wooden floor glass Label the parts of Human Ear in the following picture. Pinna Ear canal Ear drum Cochlea Bones Auditory nerve Pinna Receives the sound from the surrounding Ear canal Connects Outer Ear with Inner Ear Ear drum A thin flap of skin that is stretched tight like a drum in our ear and vibrates when sound hits it. Cochlea the part of the inner ear involved in hearing. It is a spiral-shaped cavity in the bony structure filled with fluid and has tiny hair. Auditory nerve The sensory nerve that transfers auditory information from the cochlea to the brain.