How many lines in a grating must be illuminated to obtain a resolving power of 400 in a fourth-order spectrum?
a. 1,600
b. 100
c. 400
d. 10
e. 40
b
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Indicate whether the statement is true or false
Refracting Telescope: The focal length of the objective lens of a telescope is 75.0 cm, and the eyepiece has a focal length of 6.00 cm. What is the magnification of this telescope?
A. 0.0800 B. 0.645 C. 450 D. 12.5 E. 200
When does a protostar become a true star?
A) when the star is 1 million years old B) when the central temperature reaches 1 million Kelvin C) when nuclear fusion begins in the core D) when the thermal energy becomes trapped in the center E) when the stellar winds and jets blow away the surrounding material
In accord with general relativity, a person living at the top of a skyscraper ages
A) faster than a person on the ground floor. B) slower than a person on the ground floor. C) at the same rate as a person on any floor.