A student tests the emission spectra of various known substances and an unknown substance. Which statement is a qualitative observation of the tests?
A. Two emission lines were seen in the spectra between 400 and 500 nm.
B. The unknown substance contains barium ions.
C. Sodium produces a yellow flame when heated.
D. Nitrate ions have no effect on the color emission.
Answers: 3
Physics, 22.06.2019 13:30
If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?
Answers: 2
A student tests the emission spectra of various known substances and an unknown substance. Which sta...
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