Answer:
All waves have amplitude, wavelength, and frequency.
Explanation:
A sound wave's frequency is experienced as the wave's pitch. The amplitude determines loudness or volume. The tone of a sound wave can be recognized by the regularity of its vibration.
Ask google. Sorrry. Hope you will find the answer.( I know I’m not helpful)
the Marshall Plan(also known as The European Recovery Program) was an american initiative passed in 1948 to aid western Europe. the amount which USA paid was about 12billion dollars in economic assistance.