Lens-Maker Formula: The radius of curvature of the curved side of a plano-convex lens made of glass, having index of refraction 1.64, is 33 cm. What is the focal length of the lens?
A. 52 cm
B. -52 cm
C. 21 cm
D. -21 cm
Answer: A
Physics & Space Science
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A series RLC circuit has R = 200 
L = 40.0 mH, and C = 120 pF. What is the impedance of this circuit at resonance?
A. 18.0 k
B. 36.0 k
C. 400
D. 300
E. 200
Physics & Space Science
Which type of nebula is produced when a star, hotter than 25,000 K, excites the gas near it to produce an emission spectrum producing a distinctive pink color?
a. emission nebulae b. H I c. reflection nebulae d. dark nebulae e. spectral type B6
Physics & Space Science
Suppose you built a scale-model atom in which the nucleus is the size of a tennis ball. About how far would the cloud of electrons extend
A) several kilometers B) a few meters C) several centimeters D) to the Sun
Physics & Space Science
What two factors can change a rock's melting point?
What will be an ideal response?
Physics & Space Science