long vowel sounds activities

The fan driven by an electric motor reduces the pressure near the mouthpiece. The pressure due to atmosphere being large, forces air along with dust particles into the long tube and then, into the bag. The fan forces the air out of the sweepe..

Let a long coiled spiral spring be suspended horizontally from a wooden frame using a number of threads. Ordinarily, the turns of the spring will be equidistant. On giving a sharp tap to one end of the spring, a few turns will come closer together. This state of compression moves forward..

Wave Motion and Sound..

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Wave Motion and Sound..

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sound is given by the formula The velocity of sound in iron was determined by two French investigators by striking one end of a long series of connected iron pipes with a hammer and measuring the time interval between the two sounds heard at the other end..

Active Immunity - Active immunity develops as a result of the contact of an individual with pathogenic organisms or their products. They stimulate the body to produce antibodies in response to the antigens. The immunity thus produced is specific for a particular disease. For e.g..

A narrow and long hollow tube of glass or a metal, open at both ends is taken. It is partially immersed vertically in a tall jar containing water. The length of the tube above the water level in the jar serves as an air column whose natural frequency depends on its length and the diameter..