Final answer:
The amplitudes of waves can add up even if they are not propagating in the same line.
Step-by-step explanation:
The given statement is False. The amplitudes of waves can add up even if they are not propagating in the same line. When two waves meet, they superimpose, which means their amplitudes can add up or cancel out depending on their phase difference. For example, when two waves with the same amplitude and frequency meet in a constructive interference, their amplitudes add up and the resulting wave has a higher amplitude.