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Author Question: The Andromeda Galaxy (M31) is what type? a. Spiral b. Irregular c. Elliptical d. Regular ... (Read 58 times)

audie

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on: Jul 28, 2018
The Andromeda Galaxy (M31) is what type?
 a. Spiral
  b. Irregular
  c. Elliptical
  d. Regular spiral

Question 2

When a hydrogen electron is in its first excited state, its principal quantum number is
 a. zero.
  b. 2.
  c. 13.60 eV.
  d. 1.


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wuly

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Reply #1 on: Jul 28, 2018
Answer to Question 1

a

Answer to Question 2

b


audie

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Reply 2 on: Jul 28, 2018
:D TYSM

xiazhe

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Reply 3 on: Yesterday
Wow, this really help

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