Two slits are illuminated with green light (l = 540 nm). The slits are 0.05 mm apart and the distance to the screen is 1.5 m. At what distance (in mm) from the central maximum on the screen is the average intensity 50% of the intensity of the central maximum?
a. 1
b. 3
c. 2
d. 4
e. 0.4
D
Physics & Space Science
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A jet traveling at 1500 km/h passes overhead. The sonic boom produced is heard by
A) a listener on the ground. B) the jet pilot. C) both of these D) neither of these
Physics & Space Science
The percentage (by mass) of the Sun that is helium is about:
A) 91%. B) 71%. C) 27%. D) 9%. E) less than 1%.
Physics & Space Science
The nearest star system to our Sun, Alpha Centauri, is still over a parsec distant
Indicate whether the statement is true or false
Physics & Space Science
An engine that decreases the total entropy in the universe is
A. a Carnot engine. B. a refrigerator. C. a heat pump. D. impossible.
Physics & Space Science