What is the name of the scientist who discovered that all elements have a unique spectrum? bohr kepler copernicus ptolemy

The scientist who discovered that all elements hae a unique spectrum was Bohr.

Explanation:

Niels Henrik David Bohr (1885-1962) was a Danish physicist who contributed to the understanding of the atom and quantum mechanics. He was awarded the Nobel Prize in Physics in 1922.

He was the author of several books of dissemination and reflection, including Theory of Spectra and Atomic Constitution (1922), Light and Life (1933), Atomic Theory and description of nature (1934), The mechanism of nuclear fission (1939) and Atomic Physics and Human Knowledge (1958).

Bohr was awarded in 1922 with the Nobel Prize in Physics for his work on atomic structure and radiation, and in 1926 with the Franklin Medal of Physics. He was also the first to receive, in 1958, the Atoms for Peace award.

answer: a

explanation:  

stocks and bonds are the two main classes of assets investors use in their portfolios. stocks offer an ownership stake in a company, while bonds are akin to loans made to a company (a corporate bond) or other organization (like the u.s. treasury). in general, stocks are considered riskier and more volatile than bonds.

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the answer is b.india