Doubling the focal length of the objective lens of a compound microscope will change the magnification by what factor?
a. 4
c. 2
b. 1/4
d. 1/2
D
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A star of apparent magnitude 6 appears ________ times brighter than a star of apparent magnitude 7.
A. 1.00 B. 0.5 C. 13.0 D. 2.51 E. 10.0
The conservation of momentum is most closely related to
A) Newton's 1st law. B) Newton's 2nd law. C) Newton's 3rd law. D) Newton's law of gravity
Einstein's ________ constant has been revived to help us explain dark energy
Fill in the blank(s) with correct word
A small dust particle of mass 7.90 × 10-6 g is being observed under a magnifying lens
Its position is determined to within 0.0050 mm. (1 y = 3.156 × 107, h = 1.055 × 10-34 J ? s) (a) Find the minimum uncertainty in its velocity implied by the uncertainty in its position. (b) Assuming the dust particle is moving at the speed you just found, how many years would it take for the particle to move 1.0 mm?