What technique does a radio telescope use to focus incoming light?
A. dispersion
B. refraction
C. reflection
D. diffraction
Answer: C
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How much energy would be released if 2.0 kg of material was lost during a reaction?
A) 1.8 × 1017 J B) 1.5 × 1016 J C) 2.4 × 10-17 J D) 6.0 × 108 J E) 4.7 × 10-8 J
An electron microscope operates with electrons of kinetic energy 58 keV. What is the wavelength of these electrons? Assume this speed is not relativistic. (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and me = 9.11 × 10^?31 kg)
a. 3.57E–20 m b. 7.69E–13 m c. 5.10E–12 m d. 2.28E–10 m e. 1.03E–11 m
What does the Drake Equation estimate?
A: The number of planets with life on them in the Milky Way B: The number of planets with intelligent life in the Milky Way C: The number of technological civilizations in the Milky Way D: The number of civilizations within 50 light years of us E: None of the above
Refracting Telescope: The focal length of the objective lens of a telescope is 75.0 cm, and the eyepiece has a focal length of 6.00 cm. What is the magnification of this telescope?
A. 0.0800 B. 0.645 C. 450 D. 12.5 E. 200