Fermi and Szilard Achieved a Critical Mass by Using a Pile

question 53

Multiple Choice

Fermi and Szilard achieved a critical mass by using a pile of uranium and graphite that resulted in a self-sustaining fission reaction lasting _____ minutes.

• A) 2.5
• B) 5
• C) 1.5
• D) 4
• E) 4.5

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Definitions:

ACh

Acetylcholine (ACh) is a neurotransmitter involved in muscle activation, memory, and learning by transmitting signals between nerve cells.

Neurotransmitters

Neurotransmitters are chemical messengers that neurons use to communicate with each other or with muscles across synapses.

Postsynaptic Cell

The neuron or cell that receives a signal (neurotransmitter) from another neuron at a synapse.

Demyelinates

Demyelination refers to the process by which the myelin sheath, a protective covering of the nerve fibers in the brain and spinal cord, is damaged or destroyed, affecting the conduction of nerve impulses.