Compared with the Speed of Visible Light in a Vacuum

question 161

Multiple Choice

Compared with the speed of visible light in a vacuum (or in space) ,the speed of visible light in water or in glass is:

• A) faster.
• B) slower.
• C) exactly the same because the speed of light cannot vary.
• D) much faster.

---

Definitions:

Impulses

Electrical signals that travel along the neurons, enabling communication within the nervous system.

Finger Muscles

Muscles in the fingers that are primarily responsible for controlling movement and providing the ability to grip and manipulate objects.

Sodium Ions

Positively charged atoms of sodium, essential for cellular functions, including the generation and transmission of nerve impulses and the regulation of fluid balance in the body.

Neurotransmitters

Chemical substances in the body that help in transmitting signals across a synapse from one neuron to another.