
If two similar waves are traveling in the same medium, then they have same wave velocity. so we can infer that

Now, as per the formula ~ we know that :

Now, we can write it as :

And it's also given that frequency of wave A is 3 times that of frequency of wave B.
So, let's add the relation to our equation ~



So, choice C is correct ~
Answer:
A
Explanation:
since the person is giving smone something which they will use and they are being shown as a active voice
Answer: Diveing
Explanation: In most words that add an -ing to it, they drop out the e and put the -ing onto the rest of the word. Here's some examples:
Make- Makeing✖ Making✓
Bake- Bakeing✖ Baking✓
Ride- Rideing✖ Riding✓
The word.....its as a whole committee is single
enjoy !!