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A water strider sits on a the surface of a still lake. A rock thrown into the lake creates a series of sinusoidal ripples that pass through the location where the strider sits, so that it rises and falls. The distance between its highest and lowest locations is 0.008 m. What is the amplitude of the wave, .002m, .004 m, or .008 m?
You have two strings of different linear densities tied together and stretched end-to-end between a pair of supports. What happens to the speed of a wave that passes from the more dense string to the less dense one? does the speed increase, decrease, or no change(not change at all)?
When sports spectators do "the wave," are they making a transverse or longitudinal wave? Explain.
Many children are lined up at an ice cream stand. If the child at the back pushes the child in front of him, and she in turn pushes the child in front of her, and so on, will they create a transverse or longitudinal wave in the line? Explain.
A grade-school teacher insists that the the overall sound level in his classroom not exceed 64 dB at his location. There are 25 students in his class. If each student talks at the same intensity level, and they all talk at once, what is the highest sound level at which each one can talk without exceeding the limit? answer in Db(decibels)
Jane and Sam alternately pound a railroad spike into a tie with their hammers. The crew chief has a migraine, and notes that Jane's hammer blows cause a sound with intensity 5.0 times greater than the sound that Sam makes when he swings his hammer. What is the difference in sound level between the two sounds? answer in dB(decibels)
The sound of heavy automobile traffic, heard at a certain distance, has a sound level of about 75 dB. What is the intensity of the noise there? answer in W/m^2.
Sound spreads radially in all directions from a source with power 15.3 W. If the intensity you experience is 3.00×10−6 W/m2, how far away are you from the source? answer in meters.
A longitudinal wave spreads radially from a source with power 345 W. What is the intensity 40.0 meters away? answer in W/m^2.
15.0 meters from a sound source that radiates freely in all directions, the intensity is 0.000550 W/m2. What is the rate at which the source is emitting sound energy? answer in Watts.
