The mass of an atom of carbon-12 (Z = 6) is less than the mass of 6 protons and 6 neutrons because of __________
Fill in the blank(s) with correct word
binding energy
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How much of the night sky is north of the celestial equator?
a. Less than one-half, because of the tilt of the equator to the ecliptic plane. b. More than one-half, because of the precession of the poles. c. Exactly one-half. d. All of the night sky.
Energy Levels: The longest wavelength photon that can be emitted by a hydrogen atom, for which the final state is n = 9, is closest to which one of the following values? (c = 3.0 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 39,000 nm B. 22,000 nm C. 7400 nm D. 16,000 nm E. 28,000 nm
Which part of the electromagnetic spectrum generally gives us our best views of stars forming in dusty clouds?
A) infrared B) visible light C) ultraviolet D) blue light
What is the frequency of a pressure wave of wavelength 2.5 m that is traveling at 1400 m/s?
A) 178 Hz B) 1.78 kHz C) 560 Hz D) 5.6 kHz