The total energy of a H-atom in its ground state is:
Correct answer: A. Negative (-Ve)
- A. Negative (-Ve)
- B. Positive (+Ve)
- C. Zero
- D. None
Explanation
In the hydrogen atom, the force we are primarily referring to is the attractive force acting between the nucleus and the electron and this is obviously electrical in natureWe know for a fact from Coloumb's Law, that the electrostatic force between two like charges is positive in sign, while that between two unlike charges is negative in sign; Hence negative force means that it is attractive in nature;Therefore, this negative force vector and its multiplied value with the displacement vector (which is always considered positive since the nucleus is the origin) gives the value of the electron's energy in the negative sign hence option A is correct.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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About Spectrum of Hydrogen
The hydrogen spectrum consists of discrete emission lines produced when electrons fall between quantised energy levels and release photons. Questions use the Rydberg equation, photon energy and wavelength, and identify the Lyman, Balmer, Paschen, Brackett and Pfund series, which differ from continuous spectra.
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