You and I are emitting primarily
A) X-ray radiation. B) infrared radiation. C) visual radiation. D) radio radiation.
B
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What percentage of a star's total lifetime is spent on the main sequence?
A) 100% B) 50% C) 90% D) 20% E) 10%
How long would it take 4.00 × 1020 atoms to decay to 1.00 × 1019 atoms if their half-life was 14.7 years?
A) 58.8 years B) 78.2 years C) 147 years D) 29.4 years
Two long straight parallel lines of charge, #1 and #2, carry positive charge per unit lengths of ?1 and ?2 respectively. ?1 > ?2. The electric field halfway between the lines, which are separated by a distance a, has magnitude
What will be an ideal response?
The Earth is about 150 million km from the Sun, and the apparent brightness of the Sun in our sky is about 1,300 watts per square meter
Determine the apparent brightness we would measure for the Sun if we were located half the earth's distance from the Sun.