In which of these cases are the two wave points considered to be in phase with each other?

In which of these cases are the two wave points considered to be in phase with each other?

A) One point is on a crest and the other point is on a trough.  

B) One point is at the equilibrium position and the other point is on a trough.  

C) One point is at the equilibrium position and the other point is on a crest.  

D) The two points are both on troughs

D  

these are 'in phase'  

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The answer is d

Explanation:

Ik because I have the same question put d and got it right

it is important to conserve water because there is very limited amount of freshwater here on earth and if we are not smart about how we use it we will only be runnning out of our supply faster than neccessarry.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).