The fact that there are definite energy levels in the radiation spectra is known since light wavelength has been linked with the energy quantum (Einstein 1905 - Δ=ℎ.). These energy differences explain the reason why the spectrum of atoms is discontinuous (formed by spectral lines).
Bohr had the idea to link it to a change in the orbit radius of the electron around the nucleus (The idea that H atom could be formed by the association of one proton and one electron had been suggested a couple of years before by E. Rutherford).
This outstanding idea was perfected by a whole series of remarquable physicists in the years 1920–1930. It even continues to be refined to this day, where it forms the basis of atomic spectroscopy.
Correct Answer: option
B: <span> helium and hydrogen
Reason:
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The nebular hypothesis is the most widely accepted theory that explains the formation and evolution of the Solar System. It was proposed by I. Kant. According to this theory, Solar System formed from nebulous material. Further, according to the nebular hypothesis, stars form the massive and dense clouds of molecular hydrogen.
Answer:
it takes 100 gallons longer to boil then it does 1 gallon
Explanation:
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