PLEASE HELP ANSWER ASAP two sound waves have the two respective frequencies f = 200Hz and f = 500Hz
Calculate: a) the number of vibrations made by each wave during 5s
b) their two respective wavelengths d and 'd
c) successively compare their two: heights, vibration numbers and wavelengths. interpret the results obtained

PLEASE HELP I DONT KNOW THIS AND WE GOT AN EXAM IN 1 HOUR​

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.