Which of the following is most important in causing a cloud of gas to collapse to form a star and planets?
A) Gravity pulls all the gas inward.
B) Pressure from other gas clouds pushes the gas inward.
C) Opposite charges in the gas attract.
D) Some gas is sent outward, causing the rest to move inward to conserve momentum.
E) Pressure from light from nearby stars pushes the gas inward.
A) Gravity pulls all the gas inward.
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Light of wavelength ? = 540 nm passes through a pair of slits with separation 3.4 × 10-5 m. What is the angle corresponding to the second bright fringe?
A) 1.8° B) 3.7° C) 4.3° D) 1.5° E) 5.0°
Even with perfect optics, what is the resolution limit (in radians) of the Hubble Space Telescope when it is focusing light of wavelength 400 nm? The mirror diameter is 2.4 m
What will be an ideal response?
A doubly convex thin lens is made of glass with an index of refraction of 1.52. The radii of curvature of the faces of the lens are 60 cm and 72 cm. What is the focal length of the lens?
A) 70 cm B) 63 cm C) 75 cm D) 66 cm E) 58 cm
Contrast apparent and absolute magnitudes
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