A convex lens has focal length f. If an object is located extremely far from the lens (at infinity), the image formed is located what distance from the lens?
A) 2f
B) f
C) between the lens and f
D) infinity
E) between f and 2f
B
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An object of mass m is attached to a horizontal spring, stretched to a displacement A from equilibrium and released, undergoing harmonic oscillations on a frictionless surface with period T0. The experiment is then repeated with a mass of 4m. Choose the new period of oscillation
1. 2T0 2. T0 3. T0/2 4. T0/4
At the end of the Ordovician, many shallow-marine organisms went extinct due to
A) deep water predators. B) a long duration of high sea level. C) cooling temperatures, increased glaciation, and decreased sea level. D) cooling temperatures, increased glaciation, and a rise in sea level.
The ratio of the density of a neutron (r = r0A1/3) to the density of a classical electron (re = ke2/mec2 = 2.8 × 10^?15 m) is
a. 4.3 × 10^2 b. 2.3 × 10^4 c. 1.4 × 10^2 d. 6.9 × 10^?3 e. 4.3 × 10^3
What is the purpose of qualitative analysis?