The energy required to move an electron in a hydrogen atom from energy level 1 to energy level 2 is:
A) 10.2 eV.
B) 12.1 eV.
C) 12.75 eV.
D) 13.1 eV.
E) 13.6 eV.
A
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Consider the use of the terms "rotation" and "revolution". In physics:
a. the words are used interchangeably. b. the words are used interchangeably but "rotation" is the preferred word. c. the words have different meaning. d. "rotation" is the correct word, and "revolution" should not be used.
The distance between two successive ‘like' points on a wave is the wave's __________
Fill in the blank(s) with correct word
Each factor in the Drake Equation has a well-known, established value
Indicate whether the statement is true or false
Asteroid Ida was photographed by the Galileo spacecraft in 1993, and the photograph revealed that the asteroid has a small moon, which has been named Dactyl
From the dimensions of Ida and its general features, one can estimate the mass of Ida to be 4.5 × 1016 kg, and the distance between Dactyl and Ida is approximately 90 km. Assuming a circular orbit, what would be the orbital speed of Dactyl? (G = 6.67 × 10-11 N ? m2/kg2 ) A) 2.9 m/s B) 5.8 m/s C) 30 m/s D) 11 m/s E) 2.3 m/s