When a tuning fork vibrates over an open pipe and the air in the pipe starts to vibrate, the vibrations in the tube are caused by
a. harmonics.
b. beats.
c. reinforcement.
d. resonance.

The correct answer would be d. resonance

Resonance is the phenomenon which occurs when the frequency of the forced vibrations is almost equal to the natural frequency of the system. It amplifies the sound produced by the system.

Similarly, when the tuning fork is vibrated at the natural frequency of the open pipe, the air in the pipe starts vibrating at the same frequency and results in the increased amplitude of the sound.

1. efficient use of space

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4. lower carbon footprint

after a the power stroke, adp is released, but the cross-bridge formed is still in place. atp then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.