Spherical Mirrors: An object is placed near a concave mirror having a radius of curvature of magnitude 60 cm. How far should you place the object from the mirror so that the lateral magnification produced by the mirror will be +2.5?
A. 18 cm
B. 24 cm
C. 30 cm
D. 36 cm
E. 42 cm
Answer: A
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Mean Life: The half-life of tritium is 12.3 y. What is its mean life (time constant)?
Fill in the blank(s) with the appropriate word(s).
Which would have the higher activation energy for diffusion, carbon in iron or nickel in iron? The atomic radius of carbon is 0.077 nm, the atomic radius of nickel is 0.124 nm, and the atomic radius of iron is 0.124 nm. _____________
Fill in the blank(s) with the appropriate word(s).
Solenoid: How many turns should a 10-cm long ideal solenoid have if it is to generate a 1.5-mT magnetic field when 1.0 A of current runs through it? (?0 = 4? × 10-7 T ? m/A)
A. 12 B. 15 C. 120 D. 1200 E. 3200
The primary difference between the special theory of relativity and the general theory of relativity is that the general theory also describes
A) the nature of gravity. B) length contraction. C) time dilation. D) the constancy of the speed of light.