An aquarium contains a 5-cm layer of water (n = 1.33) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the air is 30°, what is the angle of refraction into the carbon tetrachloride?
a. 58°
b. 69°
c. 37°
d. 20°
e. 75°
d
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What is the phase difference when two waves, traveling in the same medium, undergo constructive interference?
a. 270° c. 90° b. 180° d. 0°
For two beams of light traveling different distances in reaching a point, and to form maximum constructive interference at that point, the beams must travel paths that differ by a whole number of wavelengths
Indicate whether the statement is true or false
What are the limitations to travelling between stars?
What will be an ideal response?
What direct evidence do astronomers have that supports the heavy element formation in stars?
A) The presence of technetium in giant star spectra B) Observed elemental abundances C) Gamma-ray emissions from decay of cobalt 56 in supernovae D) Light curves of type-I supernovae E) All of the above are evidence of this.