How is a luminosity class assigned to a star?
a. by combining the apparent magnitude with the star's parallax
b. by measuring the period of variability in the star's apparent magnitude
c. by studying the absorption line width in the spectrum of the star
d. by observing the angular size of the star's image in a photograph or digital image
c
RATIONALE: Line broadening is associated with line width.
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The focal lengths of the objective lens and the eyepiece in a microscope are 2.90 mm and 2.50 cm, respectively. An object is placed 3.00 mm from the objective
The image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm. What is the distance between the objective and the eyepiece? A) 9.9 cm B) 9.0 cm C) 15 cm D) 11 cm E) 13 cm
What gets left behind in the middle of a planetary nebula?
A.) A newborn star. B.) A white dwarf. C.) A neutron star. D.) A black hole. E.) None of the above.
When a light wave enters into a medium of different refractive index,
A) its speed, frequency, and wavelength change. B) only its speed and frequency change. C) only its speed and wavelength change. D) only its frequency and wavelength change.
Name the color hues found in the spectrum of white light