How is the angular magnification of a magnifier related to the focal length of the lens?
A. M = f/(25 cm)
B. M = f*25 cm
C. M = f + 25 cm
D. M = (25 cm)/f
Answer: D. M = (25 cm)/f
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Two wave crests are generated at opposite ends of a long rope. Will there be an instant in which the rope's amplitude is zero everywhere?
A) no B) Yes, if the waves have different amplitudes. C) Yes, if the waves have the same amplitude.
Which Terrestrial planet has the lowest density atmosphere (i.e. none)?
a) Venus b) Mercury c) Mars d) Jupiter e) Earth
Water at room temperature, 20°C, is pumped into a reactor core where it is converted to steam at 200°C. How much heat (in J) is transferred to each kilogram of water in this process? (csteam = 2 010 J/kg?°C; LV,steam = 2.26 × 103 J/g; 1 cal = 4.186 J.)
A. 3.35 × 105 B. 7.53 × 105 C. 2.67 × 106 D. 2.80 × 106 E. 3.01 × 106
Suppose two flat glass plates 30-cm long are in contact along one end and separated by a human hair at the other end. If the diameter of the hair is 50 ?m, find the separation of the interference fringes when the plates are illuminated by green light, ? = 546 nm