Question 142 of 239
If the series limit frequency of the Lyman series is then the series limit frequency of the Pfund series is:
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Answer: (A)
Series limit frequency of the Pfund series,
Atoms & Nuclei
JEE Main level, single correct, medium
Series limit frequency of the Pfund series,
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More Physics practice
- Atoms & NucleiThe energy of an electron in the ground state of hydrogen atom is . In the first excited state (), its energy is:
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Assertion (A) : Emission of electrons in photoelectric effect can be suppressed by applying a sufficiently negative electron potential to the photoemissive substance.
Reason (R) : A negative electric potential, which stops the emission of electrons from the surface of a photoemissive substance, varies linearly with frequency of incident radiation.
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Statement I: Most of the mass of the atom and all its positive charge are concentrated in a tiny nucleus and the electrons revolve around it, is Rutherford's model.
Statement II: An atom is a spherical cloud of positive charges with electrons embedded in it, is a special case of Rutherford's model.
In the light of the above statements, choose the most appropriate from the options given below. - Atoms & NucleiIn Rutherford's alpha-particle scattering experiment, only a few alpha particles rebound back because
A. The size of gold nucleus is very small as compared to the size of gold atom.
B. Alpha particle and gold nucleus have equal charge.
C. The impact parameter is minimum for a few alpha particles.
D. A few alpha particles have very high kinetic energy.
E. Only a few alpha particles undergo head-on collision with the nuclei.
Choose the correct answer from the options given below:
JEE Main Physics practice question on Atoms & Nuclei (Atomic Spectrum), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.