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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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) .

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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

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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