echolocation is a form of sensory perception used by animal such as bats tooted whales and dolphins . the animal emits and a pulse of sound (longitudinal wave) which after reflection from objects returns and is detectd by the animal echolocation waves can have frequencies of about 100,000 Hz. (A) estimate the wave length of a sea animal echolocation waves. (B) if an obstacle is 100m from the animal. how long after the animal emits a wave is its reflection defeated​

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.