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:

ECT

Electroconvulsive Therapy is a medical treatment most commonly used for severe depression that involves inducing seizures through electrical currents.

Imipramine

A tricyclic antidepressant used in the treatment of major depression and enuresis (bed-wetting).

Tranquilizers

A class of medications used to reduce tension, anxiety, and disturbances by depressing the central nervous system.

Cognitive-Behavioral Therapy

A type of therapy aimed at enhancing well-being and solving issues through the alteration of ineffective emotions, actions, and thought processes.