Which of the following effects is the result of the fact that the index of refraction of glass will vary with wavelength?
a. spherical aberration
b. mirages
c. chromatic aberration
d. light scattering
c
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What is the approximate luminosity of a main-sequence M star?
A) 10?6 solar B) 1 solar C) 10 solar D) 0.01 solar
What evidence from the careful examination of impact craters provides evidence that Mars had surface water long ago?
A) indistinct rims of many large craters due to water erosion B) lack of small craters which would have been erased by ancient rainfall C) channels where water once flowed between crater lakes D) all of these
Mass added to a pulsar from its companion can speed it up into a(n) ________ pulsar
Fill in the blank(s) with correct word
A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 × 10^11 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load?
a. 0.25 cm b. 2.5 cm c. 12.5 cm d. 25 cm e. 1.25 cm