When light shines on a sample, each element emits specific wavelengths producing a unique fingerprint called its spectra. a) infrared b) line c) raman d) ultraviolet

B) line is the correct answer.

Explanation:

When light shines on a sample, each element emits specific wavelengths producing a unique fingerprint called its line spectra.

The line spectrum is electromagnetic spectra consist of discrete spectra lines.

When the atoms are excited they emit ray of specific wavelengths that correspond to various colors. The emitted ray can be seen as a range of colored line, this range of colored lines is termed as line spectra.

lines spectra are usually utilized to recognize atoms and molecules. Each element has individual line emission spectra.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.