Line emission spectra used to study the electron structure
The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet
An absorption spectrum is like the photographic negative of an emission spectrum
The element Helium was discovered in the sun by the spectroscopic method
Show Solution
The Correct Option isA
Solution and Explanation
To determine the incorrect statements related to line emission, let's evaluate each option separately:
Statement: Line emission spectra used to study the electron structure
Evaluation: This statement is correct. Line emission spectra are indeed used to study electronic structures, as electrons transition between energy levels and emit photons at characteristic wavelengths.
Statement: The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet
Evaluation: This statement is incorrect. Emission spectra of atoms in the gas phase show discrete lines, not a continuous spread, as each line corresponds to a specific wavelength emitted by electrons transitioning between quantized energy levels.
Statement: An absorption spectrum is like the photographic negative of an emission spectrum
Evaluation: This statement is correct. An absorption spectrum consists of dark lines (or bands) on a bright continuous spectrum, corresponding to wavelengths absorbed by electrons, which aligns with the wavelengths seen as bright lines in an emission spectrum.
Statement: The element Helium was discovered in the sun by the spectroscopic method
Evaluation: This statement is correct. Helium was indeed discovered in the sun through spectroscopic methods, specifically through analysis of the sun's emission spectrum.
Based on the evaluations above, the incorrect statement is: "The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet". This makes a total of one incorrect statement.
