The Present Standard for Time Is Based on

question 22

Multiple Choice

The present standard for time is based on

• A) the transition of an electron between two energy levels of the cesium-133 atom.
• B) Earth's rotation.
• C) Earth's orbit.
• D) none of these.

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Definitions:

Electrical Charge

A physical property that causes objects to experience a force when placed in an electromagnetic field, typically described as positive or negative.

Action Potential

A temporary reversal of the electrical polarity of the cell membrane that travels along a neuron, enabling the transmission of nerve impulses.

Neurotransmitters

Chemical substances in the nervous system that transmit signals from one neuron to another across synapses.

Terminal Buttons

The small knobs at the end of an axon that release chemicals known as neurotransmitters, which transmit signals to other neurons.