While shouting, a person keeps the palm near the mouth because in that position, the sound energy will point in one direction only. This helps to direct the sound waves forward, increasing their intensity and focusing them toward the intended listener or direction, making the shout more effective.
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While shouting, a person keeps the palm near the mouth primarily because [A] in that position, the sound energy will point in one direction only. By cupping the hand around the mouth, the person creates a makeshift horn or amplifier that directs the sound waves forward. This action helps to concentrate and focus the sound energy towards the intended target or direction, increasing the intensity and clarity of the shout. It can be particularly useful in noisy environments or over distances where clear communication is necessary. This technique does not change the completeness or tone of the sound (options [B] and [C]), but rather improves the efficiency of projecting the sound waves in a specific direction. Therefore, option [A] correctly describes why people use this method while shouting.