A light ray enters a glass enclosed fish tank. From air it enters the glass at 20.° with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33
(a) What is the angle of refraction in the glass? (b) What is the angle of refraction in the water? (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?
(a) 39.°
(b) 45.°
(c) no
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What evidence suggests that life was common on Earth within a billion years of its formation?
A) Life must have formed early in order to produce the variety of lifeforms seen today. B) rocks older than 3.85 billion years with the carbon-12 to carbon-13 ratio typical of living organisms C) 3.5 billion year old rock structures formed by microbes called stromatolites D) A and C E) B and C
A water bug on the surface of a pond bobs up and down three times per second on ripples with wavelength 10.5 cm. A fish resting at the surface of the pond is 8.50 m from the water bug. How long does it take a ripple passing the water bug to reach the fish?
a. 27.0 s b. 243 s c. 81.0 s d. 0.893 s
What is the first law of thermodynamics for a system?
What will be an ideal response?
When metals become ions, they tend to
a)share their valence electrons. b)gain more electrons in their valence shells. c) lose electrons from their valence shells. d) keep their valence electrons as they were, but add protons to their nuclei.