Answer:
6m/s
Explanation:
V = frequency * wavelength
15 * 2.5 = 6m/s
That's efficiency. There's no law that it must be stated in percent.
Answer:
(D)
Explanation:
Given :
l=3.5 m


Resistance can be calculated as :


Resistance of the wire will be 1.1×
ohms
Option D is correct
A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure. The atmosphere is the layers of air wrapped around the Earth. That air has a weight and presses against everything it touches as gravity pulls it to Earth. Barometers measure this pressure.