teaching short and long vowel sounds

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..

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..

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..

The area of the kite is 216 cm 2 . The length of short diagonal is 12 cm. Find the length of long diagonal. => 39 square cm or 36 square cm or 12 square cm or 13 square cm..

Reverberation - The persistence of audible sound even after the source has ceased emitting sound is called reverberation. If the reverberation of a sound pulse persists so long as to prolong the sound while several successive pulses are produced, th..

is used before vowel sounds..

One crop is of long duration and the other is of short duration..

The immediate and acute effect of noise pollution is impairment of hearing. Damage to the eardrum can be caused by impulsive loud sounds or by prolonged exposure to noise. Long exposure to loud noise may result in hearing loss which may become permane..

These plants flower in all possible photoperiods, ranging from a few hours to 24 hours of uninterrupted light exposure. They are also called photo neutrals or intermediate plants. Examples: Tomatoes, cucumbers, sunflower, dandelions and cotton. The terms long day/short day plant..

Presence of certain inhibitory substances such as ABA, coumarin, phenolic acids, short chain fatty acids in the embryo causes seed dormancy. The seeds remain dormant as long as the concentration of these inhibitory substances remain high within the see..