Suppose you live on the Moon. When people on Earth see a first-quarter phase, what phase do you see for Earth?
A) new Earth
B) first-quarter Earth
C) crescent Earth
D) third-quarter Earth
E) full Earth
D) third-quarter Earth
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Find the frequency of X-rays of wavelength 1 Å = 10?10 m.
A. 3 × 1018 Hz B. 3 × 1010 MHz C. 6 × 109 Hz D. 3 × 108 Hz E. 3 × 1020 Hz
What is the mass of air in a room that measures 5.0 m × 8.0 m × 3.0 m? (The density of air is 1/800 that of water).
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A single thin slit forms a diffraction pattern, with the first minimum at an angle of 40.0° from central maximum. If monochromatic light of 530.0-nm wavelength is used for the illumination, what is the width of the slit?
A) 825 nm B) 791 nm C) 757 nm D) 723 nm E) 689 nm