a mega phone are used by lifeguards and cheerleaers to help tthuer voices become louder is it reflection refraction diffraction interence
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The correct answer is: amplification or simply increasing the volume of their voices. A megaphone is a device that helps to direct and project sound waves, making the lifeguard or cheerleader's voice louder and clearer. This is not related to reflection, refraction, diffraction, or interference.
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