Which of the following planets has NOT yet been studied with an orbiter?
A) Saturn
B) Mars
C) Uranus
D) Venus
C
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Radioactive Decay: The half-life of radon-222 is 3.83 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?
A. 9.82 × 107 B. 7.67 × 107 C. 8.34 × 108 D. 7.29 × 108 E. 8.56 × 108
A rocket is moving at 1/4 the speed of light relative to Earth. At the center of this rocket, a light suddenly flashes. To an observer at rest on Earth,
A) the light will reach the front of the rocket at the same instant that it reaches the back of the rocket. B) the light will reach the front of the rocket before it reaches the back of the rocket. C) the light will reach the front of the rocket after it reaches the back of the rocket.
Why was it difficult for astronomers to develop a clear understanding of the Milky Way until the last few decades?
What will be an ideal response?
From shortest wavelength to longest wavelength, which of the following correctly orders the different regions of electromagnetic radiation?
A) infrared, visible light, ultraviolet, x-rays, gamma rays, radio B) radio, infrared, visible light, ultraviolet, x-rays, gamma rays C) visible light, infrared, x-rays, ultraviolet, gamma rays, radio D) gamma rays, x-rays, visible light, ultraviolet, infrared, radio E) radio, x-rays, visible light, ultraviolet, infrared, gamma rays