Answer:
a vacuum formed above the column of mercury in a mercury barometer.
Because changing just the speed or just the wavelength/frequency has no effect on the amplitude of the wave.
Momentum has a magnitude and a direction.
Its magnitude is (mass) x (magnitude of the velocity)
Its direction is the same as the direction of the velocity.
The thing you should memorize is: Momentum = (mass) x (velocity). P=mv
The strong nuclear force is the force that holds nucleons, aka protons and neutrons in the nucleus together, through the boson called the gluon. It also holds quarks together, which constitutes the protons and neutrons.
