Spectral Classification of a Star into the Lettered Categories,O,B,A,F,G,K,and M

question 122

Multiple Choice

Spectral classification of a star into the lettered categories,O,B,A,F,G,K,and M is carried out by:

• A) finding the wavelength of peak emission in the continuum spectrum of the star.
• B) determining the relative mass of the star by the study of binary star motions, in order to place it into its proper mass classification.
• C) determining the total energy emitted at all wavelengths by the star, taking account of the full spread of wavelengths and their distances, in order to place the star into its luminosity class.
• D) examining the relative depths of absorption lines from various neutral and ionized atoms in a stellar spectrum.

---

Definitions:

Positivistic

Pertaining to the philosophy of positivism, which asserts that the only authentic knowledge is scientific knowledge, and such knowledge can only come from positive affirmation of theories through strict scientific method.

Social Problems

Issues within a society that are recognized by a significant number of people as being undesirable or needing improvement.

Industrial Revolution

A period of major industrialization from the late 18th to early 19th centuries that transformed primarily agrarian, rural societies in Europe and America into industrialized, urban ones.

Urban Environments

Refers to cities and towns, focusing on their social, economic, and physical structures, as well as the challenges and opportunities they present.