I need help with these 2 questions.

A 1.0 kg piece of copper with a specific heat of cCu= 390 J/(kg . K) is placed in 1.0 kg of water with a specific heat of cw = 4190 J/(kg . K). The copper and water are initially at different temperatures. After a sufficiently long time, the copper and water come to a final equilibrium temperature. Part A Which of the following statements is correct concerning the temperature changes of both substances? (Ignore the signs of the temperature changes in your answer.) O The temperature change of the water is greater than the temperature change of the copper. O The temperature change of the copper is greater than the temperature change of the water. O The temperature change of the copper is equal to the temperature change of the water.A string that is 12 m long is tied between two posts and plucked. The string produces a wave that has a frequency of 320 Hz and travels with a speed of 192 m/s. How many full wavelengths of the wave fit on the string