The Speed of Light Is

question 23

Multiple Choice

The speed of light is

• A)relative to the frame of reference from which it is measured.
• B)a speed approached but never quite reached by photons.
• C)constant for all observers.

---

Definitions:

Diaphragm

A dome-shaped, muscular partition separating the thorax from the abdomen in mammals, playing a major role in breathing by contracting and expanding the lungs.

Bronchi

The large air passages that lead from the trachea (windpipe) into the lungs and become smaller tubes within the lungs called bronchioles.

Trachea

A large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes, conveying air to and from the lungs.

Chronic Lower

A phrase potentially missing context but may refer to sustained low-level conditions or symptoms in a health context.