Answer:
A base.
Explanation:
Basic solutions give OH- ions.
The answers are:
1. D
2. B if it is a check all that are true it is b & d
Frequency is defined as the number of waves per second. In this machine 25 waves pass in one second.
We need to calculate the number of waves that pass a particular point during one second.
During 2 seconds -25 waves
Therefore in one second - 25/2 = 12.5 waves/s.
1 wave per second has the unit Hertz (Hz)
Therefore answer is 12.5 Hz
The answer to the question is 300meters.
Mostly in my opinion I think it’s the secound one
