
Actually Welcome to the Concept of the Wave Optics.
Whenever the waves are out of phase they form a DESTRUCTIVE interference.
thus,
Destructive Interference occurs when two waves are out of phase.
Answer:
a) V = 252 cm³
b) Vs = 72 cm³
Explanation:
a)
The volume of the water can be given by the following formula:

<u>V = 252 cm³</u>
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b)
The volume of stone can be given by the change in volume of the water when the stone is dipped into it.

<u>Vs = 72 cm³</u>
<span>the speed of something in a given direction. so i think none of these</span>
Its a thermometer . i hope this helps you