Sound Waves will be an example of mechanical waves.. hope this helps!
Answer:
I'm pretty sure its the 2nd one.
Answer:
220 V
Explanation:

As the resistors are connected in series,

= 20 + 30 + 60
= 110 ohms
V = IR
= 2 * 110
= 220 V
Hope it helps
Vertical columns on the periodic table are called groups.
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