To practice problem-solving strategy 16.2 doppler effect. the sound source of a ship’s sonar system operates at a frequency of 22.0 khz . the speed of sound in water (assumed to be at a uniform 20∘c) is 1482 m/s . what is the difference in frequency between the directly radiated waves and the waves reflected from a whale traveling straight toward the ship at 4.95 m/s ? assume that the ship is at rest in the water.

Which type of wave can travel without a medium

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.

State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory