You should check A, and D.
The resulting wave will have zero amplitude, thus it will form a straight line.
<h3>What is a crest?</h3>
A crest is an upward displacement of a progressive wave.
<h3>What is a trough?</h3>
A trough is a downward displacement of a progressive wave.
<h3>Superimposition of the two waves</h3>
When the two waves meet each other at point X, they will superimpose and cancel out since they have equal amplitude and are in opposite direction.
The resulting wave will have zero amplitude, thus it will form a straight line.
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You would have to subtract the mass number with atomic number which will give you 119 number of neutrons.
That would be newton's. You'll be studying or have studied about newton's laws of physics. Both will help you. Hope this helps!
