Answer:
4km
Explanation:
15 minutes is 1/4 of an hour.
1/4 of 16 is 4.
The nucleons(protons and neutrons) are held together by means of this strong force. If this strong never existed, all the nucleus will blow themselves due to strong repulsive force between protons(neutron has no charge).
Thats it!
If I explain beyond, it will surely bounce off your head. Anyways, if you wanna know more bout it, ping me. (:
from rarefaction to rarefaction for a longitudinal wave
Pressure difference (voltage)
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