How can you change the amplitude of a wave?

"Changing the amplitude of a signal is straightforward: We just need to multiply each sample with some constant number. In the case of sine waves, if what we want is a wave with amplitude a, our wave function becomes y = a * Math.sin(x)."

Explanation:

Risk*

v 154.9= 0.9 length length s little over 154.9cm

wavelength divides in half and speed stays the same.