There is direct evidence for the discreteness of energy levels in atoms
What will be an ideal response?
Yes, the atomic spectra, as seen in person or in Fig. 6.2 provide such evidence.
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Why is the number of galaxies in the Local Group uncertain?
What will be an ideal response?
Using the ideas discussed in your text, in what sense are we "star stuff"?
A) The overall chemical composition of our bodies is about the same as that of stars. B) Movie stars and other people are all made of the same stuff, so we all have the potential to be famous. C) Nearly every atom from which we are made was once inside of a star. D) We could not survive without light from our star, the Sun.
What is the result of adding 23.4 to 91.237 and then subtracting 23.4?
A) 91.237 B) 91.2 C) 91.3 D) 91.0 E) 91.
Who discovered the nucleus of the atom in 1911?
a. Thomson b. Rutherford c. Dalton d. Bohr