Entries by Hannah Wangui

Explain why ionized calcium can form absorption lines, but ionized hydrogen cannot.

October 16, 2019 in /by

Question Explain why ionized calcium can form absorption lines, but ionized hydrogen cannot. a. Neutral calcium contains more than one neutron; neutral hydrogen contains only one. There are no electrons in ionized hydrogen and absorption probability is very low. b. Neutral calcium contains more than one proton; neutral hydrogen contains only one. Hydrogen cannot be […]

 

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How many times heavier is a He atom compared to a H atom?

October 16, 2019 in /by

Question How many times heavier is a He atom compared to a H atom? a. A helium atom is ~2 times heavier than a hydrogen atom. b. A helium atom is ~5 times heavier than a hydrogen atom. c. A helium atom is  ~8 times heavier than a hydrogen atom. d. A helium atom is ~4 times heavier than a hydrogen atom.   Looking for a […]

 

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Describe two ways an atom can become excited.

October 16, 2019 in /by

Question Describe two ways an atom can become excited. a. By emission of a photon and by collision with other atoms. b. By absorption of a photon and by atom decay. c. By emission of a photon and by atom decay. d. By absorption of a photon and by collision with other atoms.   Looking […]

 

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Describe the process of spectrum production by a neon sign.

October 16, 2019 in /by

Question Describe the process of spectrum production by a neon sign. a. Neon atoms become excited by electricity, then an electron inside the atom goes to a higher energy level, emitting energy as a photon. b. Neon atoms become excited by rapid heating, then an electron inside the atom drops to a lower energy level, […]

 

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