3. A sine wave with wavelength A and period T is described by A sin (277 (-)) is superposed on another with wavelength 21 and period 27. What is the wavelength and period of the combined wave? 4. A 1.0-kg object undergoes simple harmonic motion with an amplitude of

A sound wave propagates in air at 27C with frequency 4.00 kHz. It passes through a region where the temperature gradually changes and then moves through air at 0C. Give numerical answers to the following questions to the extent possible and state your reasoning about what happens to the wave physically. (a) What happens to the speed of the wave? (b) What happens to its frequency? (c) What happens to its wavelength?

How can an object move with respect to an observer so that the sound from it is not shifted in frequency?

A certain vibrating string on a piano has a length of 74.0 cm and forms a standing wave having two antinodes. (a) Which harmonic does this wave represent? (b) Determine the wavelength of this wave, (c) How many nodes are there in the wave pattern?