A pencil partially submerged in a glass of water appears broken or offset because of
a. polarization.
b. diffraction.
c. interference.
d. refraction.
d
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Draw the three structural formulas for the molecular formula C3H8O
Stream velocity is faster in a
A) flat bottomed, shallow stream channel. B) rounded, relatively deep stream channel. C) stream with a very steep gradient. D) canyon.
Radio maps of the spiral arms of our galaxy Group of
a.They map the location of dense neutral hydrogen clouds b.They map the location of hot O and B stars by the radio radiation they emit c.They reveal that the Sun is currently located in the centre of a spiral arm d.They reveal that our galaxy is a grand design spiral
Two large parallel plates are separated by 1.0 mm of air. If the potential difference between them is 3.0 V, what is the magnitude of their surface charge densities? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 2.7 × 10-8 C/m2 B) 1.6 × 10-4 C/m2 C) 5.3 × 10-8 C/m2 D) 3.3 × 10-4 C/m2