Thin Lenses: A 3.0-cm tall statue is 48 cm in front of a convex lens having a focal length of magnitude 20 cm.(a) Is the image of the statue real or virtual?(b) How far is the image from the lens?(c) Is the image upright or inverted?(d) How tall is the image?
What will be an ideal response?
(a) real (b) 34 cm (c) inverted (d) 2.1 cm
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What happens when the index of refraction is equal to 1?
a. No refraction occurs. b. Light cannot pass into the material. c. An average amount of refraction takes place. d. The maximum possible refraction occurs. e. The index of refraction cannot be calculated for this material.
Computer monitors are often referred to as CRT's. CRT stands for
A) computer registration tube. B) color relay transmission. C) computer resource transmission. D) nothing; it's computer jargon. E) cathode ray tube.
The major product of the fusion of 4 protons in the Sun's core is a(n) ________ nucleus
Fill in the blank(s) with correct word
Which of these is the best explanation of the "electric hair" that can occur when some people brush their hair?
A) Excess electrons flow onto both the brush and the hair, causing the hairs to repel each other and causing the brush to repel the hairs. B) The atoms of the brush and hair are set into rapid vibration, causing them to emit electromagnetic waves, which causes the hairs to stand up. C) Electrons are brushed either from the hair onto the brush, or vice-versa, causing the brush and hair to be charged, so that the hairs then attract each other while the brush repels the hairs. D) The atoms of the brush and hair are heated, causing their electrons to move faster, which spreads out the atoms and thus causes the hairs to stand up. E) Electrons are brushed either from the hair onto the brush, or vice-versa, causing the brush and hair to be charged, so that the hairs then repel each other while the brush attracts the hairs.