The region on the H-R diagram where pulsating variables occur is called the:
A) period-luminosity relation.
B) mass-luminosity relation.
C) instability strip.
D) horizontal branch.
E) main sequence appendix.
C
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What power lens is needed to correct for farsightedness where the uncorrected near point is 75 cm?
A) -2.67 D B) +2.67 D C) +5.33 D D) -5.33 D E) +1.00 D
Shapley found the globular cluster distribution equally concentrated all along the galactic plane
Indicate whether the statement is true or false
The law of conservation of momentum is applicable to systems made up of objects described by which of the following?
a. macroscopic c. interacting through friction b. microscopic d. All the above choices are valid.
White light is spread out into spectral hues by a grating. If the grating has 2000 lines per centimeter, at what angle will red light (640 nm) appear in the first order?
A) 3.57° B) 7.35° C) 11.2° D) 13.4° E) 14.7°