Twenty fluorescence spectra were signal averaged to yield a resulting spectrum with a signal/noise ratio of 30: 1. how many spectra would you need to acquire and signal average in order to attain a signal to noise ratio of 100: 1? put minimum number needed

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).