How many electrons are there in the third shell of sodium, Na (atomic number 11)?
A) none
B) one
C) two
D) three
Answer: B
Physics & Space Science
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Where do the names for the moons of Mars (Phobos and Deimos) come from?
A) the founders of Rome B) the twins depicted in the constellation Gemini C) the names of their discoverers D) the sons of Ares and Aphrodite E) the names of the dogs of Orion
Physics & Space Science
When the length of a simple pendulum is tripled, the time for one complete vibration increases by a factor of
A) 9. B) 1/9. C) 3. D) 1/3. E) .
Physics & Space Science
Green light has a wavelength of 5.4 × 10^?7 m. What is the frequency of this EM-wave in air?
a. 5.55 × 10^14 Hz b. 6.00 × 10^11 Hz c. 9.00 × 10^8 Hz d. 3.00 × 10^10 MHz e. 1.80 × 10^15 Hz
Physics & Space Science
The asthenosphere is the region of Earth directly below the ______________
Fill in the blank(s) with correct word
Physics & Space Science