If You Find That the H-Alpha Line in a Star's

question 84

Multiple Choice

If you find that the H-alpha line in a star's spectrum occurs at a wavelength of 656.45 nm, what is the star's radial velocity? Note that the rest wavelength of this line is 656.30 nm.

• A) 150 km/s away from you
• B) 150 km/s toward you
• C) 350 km/s toward you
• D) 70 km/s away from you
• E) 70 km/s toward you

---

Definitions:

Medullary Cavity

The central cavity within the shaft of long bones where bone marrow is stored.

Compact Bone

The dense, hard outer layer of bone that provides strength and protection to the skeleton.

Cancellous Bone

A type of bone tissue with a sponge-like structure found inside bones, providing strength and flexibility.

Ribs

Long, curved bones that form the rib cage, providing protection for the thoracic organs and support for the upper body.