Traveling waves propagate with a fixed speed usually denoted as v (but sometimes c). the waves are called if their waveform repeats every time interval t.

periodic wave

Explanation:

A wave which travels or propagates at a constant speed is called a periodic wave. It takes place in one dimensional space. These waves are used in almost every discipline of science and mathematics.

These waves are a function of time and space. It has the following properties frequency, wavelength, amplitude, time period.

Hence, the statement here is referring to periodic waves.

explanation:

specific heat is the amount of heat required to raise the temperature of a unit mass of a substance.

graph question answered .. you think better when you are relaxed and happy