Which one of the hydrogen atoms below is EMITTING light at a wavelength in the Balmer series?
a. second energy level to first (most bound)
b. third energy level to second
c. fourth energy level to third
d. second energy level to third
e. first energy level to second
b
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After correcting for detection limitations, what do astronomers believe is the most common type of exoplanet?
A. Ice giants B. Super-Earths C. Terrestrial D. Gas giants E. None of these choices are correct.
What is the difference between a boundary and a surface?
What will be an ideal response?
If the length and diameter of a wire of circular cross section are both tripled, the resistance will be
A) unchanged. B) increased by a factor of 9. C) 1/3 of what it originally was. D) 1/9 of what it originally was. E) tripled.
There is good evidence that life on Earth was thriving prior to 3.85 billion years ago
Indicate whether the statement is true or false