Free or low-cost ______ images, including photographs and clip art, are available online.

A. stock
B. generic
C. spec
D. streaming


Answer: A

Physics & Space Science

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Which moon orbits Pluto?

a. Ceres b. Eris c. Charon d. Oberon e. Triton

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What is the energy of a photon with the Compton wavelength (0.00437 nm)? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 eV = 1.60 × 10^?19 J)

a. 4.55E–14 eV b. 2.84E+5 eV c. 2.84E+1 eV d. 3.52E–6 eV e. 4.55E+5 eV

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Which of the following is NOT icy in composition?

A) comet nuclei B) Kuiper Belt Objects C) the polar cap of Mars D) asteroids E) most Jovian satellites

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The Earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax. How distant is the star, in km?

A) 1.2 × 1011 km B) 1.2 × 1014 km C) 1.2 × 1017 km D) 1.2 × 1020 km E) 1.2 × 1023 km

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