When a sound wave travels directly toward a hard wall, the incoming and reflected waves can combine to produce a standing wave. there is an antinode right at the wall, just as at the end of a closed tube, so the sound near the wall is loud. you are standing beside a brick wall listening to a 85 hz tone from a distant loudspeaker. how far from the wall must you move to find the first quiet spot?

According to newton's second law, when the same force is applied to two objects of different masses, a the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration, b. the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration, c. the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration, d. the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration.

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In order of decreasing light-transmitting capabilities of materials, which is the correct sequence? a. transparent -> translucent -> opaque b. opaque -> transparent -> translucent c. opaque -> translucent -> transparent d. translucent -> transparent -> opaque