What is the closest planet to the sun?
a. Neptune
b. Uranus
c. Earth
d. Mercury
e. Venus
Answer is d. Mercury
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Which of the following is ordered correctly from largest to smallest planet?
a. Neptune, Saturn, Moon, Earth b. Venus, Mercury, Jupiter, Saturn c. Mars, Earth, Saturn, Jupiter d. Uranus, Saturn, Venus, Earth
The energy differences in some of the rotational energy levels of the water molecule allow
a. X-rays to be produced. b. cooking with microwaves. c. visible spectral lines to be formed. d. lasers to operate.
An electronic component with a 17-? resistor is rated for use at power levels not exceeding 14W. How much current can safely flow through the component?
A) 0.91 A B) 1.21 A C) 238 A D) 0.22 A
The penumbra caused by an extended light source, as seen in this figure, results from what?
a. The superposition of images from point light sources spread throughout the region covered by the extended source. b. The poorer quality light source in the right hand figure. c. The image of the extended light source on the screen. d. Scattered light from other nearby objects. e. Light leaking into the room from outside sources.