A room inside a recording studio is lined with soft foam in order to absorb the energy of sound waves produced inside the room. How will sound waves
interact with the foam?
A. The foam will take up some of the waves' energy, decreasing their
amplitude.
OB. The foam will cause constructive interference, increasing the
waves' amplitude.
O C. The foam will reflect the waves, causing an echo.
D. The foam will refract the waves, causing their frequency to
change.

Follow these directions and answer the questions. 1. set up the ripple tank as in previous investigations. 2. bend the rubber tube to form a "concave mirror" and place in the ripple tank. the water level must be below the top of the hose. 3. generate a few straight pulses with the dowel and observe the reflected waves. do the waves focus (come together) upon reflection? can you locate the place where the waves meet? 4. touch the water surface where the waves converged. what happens to the reflected wave? 5. move your finger twice that distance from the hose (2f = c of c, center of the curvature) and touch the water again. does the image (the reflected wave) appear in the same location (c of c)? you may have to experiment before you find the exact location. sometimes it is hard to visualize with the ripple tank because the waves move so quickly. likewise, it is impossible to "see" light waves because they have such small wavelengths and move at the speed of light. however, both are examples of transverse waves and behave in the same way when a parallel wave fronts hit a curved surface.

Three charge are arranged as shown in the diagram. the magnitude of the net electrical force acting on the +6 uc charge, rounded to the tenths place, is .

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?