Briefly explain why spectral lines are useful in determining the chemical composition of their source
What will be an ideal response?
Every chemical element has a unique set of atomic energy levels and therefore a unique set of spectral lines. Thus, by identifying spectral lines, we can identify the elements that produced them.
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If Earth is closest to the Sun in January of each year, what can we say about the speed of Earth in its orbit around the Sun at this time of year?
Two 3-? resistors are connected in series. Another 3-? resistor is then connected in parallel to the two already in series. The resulting combination has what resistance?
1. 1 ? 2. 2 ? 3. 4 ? 4. 5 ?
A brass cube, 10 cm on a side, is raised in temperature by 150°C. The coefficient of volume expansion of brass is 57 × 10^-6/°C. By what percentage is any one of the 10-cm edges increased in length?
a. 4% c. 0.38% b. 2.8% d. 0.29%
A 480-kg car moving at 14.4 m/s hits from behind a 570-kg car moving at 13.3 m/s in the same direction
If the new speed of the heavier car is 14.0 m/s, what is the speed of the lighter car after the collision, assuming that any unbalanced forces on the system are negligibly small? A) 13.6 m/s B) 10.5 m/s C) 19.9 m/s D) 5.24 m/s