- Exam
- JEE Main
- Year
- 2023
- Date
- 8 April
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Structure of Atom
JEE Main 2023 · 8 April · Morning Shift · Chemistry · Structure of Atom
The number of following statement/s which is/are incorrect is...
The number of following statement/s which is/are incorrect is ______
A) Line emission spectra are used to study the electronic structure
B) The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet.
C) An absorption spectrum is like the photographic negative of an emission spectrum
D) The element helium was discovered in the sun by spectroscopic method
Correct answer
0
Step-by-step solution
The emission spectrum of a element is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state. The energy of the emitted photon is equal to the energy difference between the two states. There are many possible electron transitions for each atom, and each transition has a specific energy difference. This collection of different transitions, leading to different radiated wavelengths, make up an emission spectrum. Each element's emission spectrum is unique.
The emission spectra of atoms in the gaseous phase do not show a continuous spread of wavelength from red to violet, rather they emit light only at specific wavelengths with dark spaces between them.
An absorption spectrum is like the photographic negative of an emission spectrum. The element helium was discovered in the sun by spectroscopic method.