What is the percent uncertainty in the area of a circle whose radius is 1.8 × 104 cm?
A)
1.1%
B)
5.6%
C)
11%
D)
24%
E)
56%
C
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According to the laws of thermal radiation, hotter objects emit photons with ________
A) a higher average speed B) a lower average energy C) a lower average frequency D) a shorter average wavelength
What reaction would be taking place if you were charging the battery?
In a battery, if the following oxidation-reduction reactions takes place normally: Mn2O3 + ZnO ? 2 MnO2 + Zn A) 2 MnO2 + Zn ? Mn2O3 + ZnO B) ZnO ? Zn C) Mn2O3 ? MnO2 D) all of the above E) none of the above
Which of the following describes parallax?
A) It is best measured over exactly one year intervals. B) It is inversely proportional to the distance to the star. C) It was first observed by Galileo with his new telescope. D) It is only applicable to objects within the solar system. E) It is more accurate as the distances to objects becomes greater.
A slit of width 0.01 mm has light of wavelength 600 nm passing through it onto a screen 60 cm away. How wide (in cm) is the central maximum?
A) 0.12 cm B) 7.2 cm C) 1.8 cm D) 3.6 cm E) 0.9 cm