The person who first explained the discrete hydrogen atom spectrum was __________
Fill in the blank(s) with correct word
Neils Bohr
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What conditions are necessary for an annular solar eclipse?
A) New Moon on equator at perigee B) Full Moon on ecliptic at perihelion C) New Moon on ecliptic at perigee D) New Moon on equator at apogee E) New Moon on ecliptic at apogee
A charged particle is observed traveling in a circular path in a uniform magnetic field. If the particle had been traveling twice as fast, the radius of the circular path would be
A) twice the original radius. B) four times the original radius. C) 1/ times the original radius. D) one-half the original radius. E) one-fourth the original radius.
The ______________ surrounds the nucleus of a comet
a. head or coma b. cloud c. fuzz d. cover e. epinucleus
One year is about _____ seconds while one day is exactly _____ seconds
a. 3.16 × 10^7, 86,400 c. 3.16 × 10^7, 8640 b. 5.26 × 10^5, 86,400 d. 1.04 × 10^6, 36,000