How many decibels correspond to a sound intensity of 7.0 × 10-7 W/m2?
A) 70
B) 58
C) 69
D) 75
E) 63
B
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A dime is 1.8 cm in diameter. Earth's Moon is 3.844 × 10^10 cm from Earth and has a diameter of 3.76 × 10^8 cm. At what distance from your eye would you have to hold a dime so that it has the same angular diameter as the full Moon?
a. 200 cm b. 2 cm c. 0.2 cm d. 2 AU e. 2 LY
X-ray radiation typically comes from
A) higher-energy electrons orbiting the nucleus in atoms. B) electrons moving along a metal antenna. C) thermal vibrations of molecules. D) charged particles moving within the nucleus. E) None of the above.
A magnetic field exerts a force on an electric charge if the charge is
a. positive b. negative c. moving d. stationary e. any of the above
Contrast the brightest stars of young open and old globular clusters
What will be an ideal response?