DefinePK

Description

welcome to candle academy Pakistan. in this lecture we have solved all exercise conceptual questions of chapter 19
atomic spectra for class 12 Physics Federal board and KPK board.

Conceptual question 19.1
Why does the spectrum of hydrogen consists of many lines even though the hydrogen atom has only a single electron?


Conceptual question 19.2
Suppose that electron in a hydrogen atom obeyed the classical mechanics rather than quantum mechanics. Why would such a hypothetical atom in emit a continuous spectrum rather than the observed line spectrum?

Conceptual question 19.3
Can electron in the ground state of hydrogen atom absorb a photon of energy.
a. less than 13.6 electron volt
b. greater than 13.6 electron volt? explain.
Conceptual question 19.4
Why do solids give rise to continuous spectrum while hot gases give rise to line spectrum?



Conceptual question 19.5
Explain the difference between laser light and light from an incandescent lamp.

Conceptual question 19.6
Why Bohr extends the quantum theory to the structure of the atom?

Conceptual question 19.7
Why helium has larger ionization energy than hydrogen?

Conceptual question 19.8
X rays can emit electrons from metal surface and x rays can be deflected comment?

Conceptual question 19.9
why X-rays have different properties from light even though both originate from orbital transition of electron in excited atoms?

Conceptual question 19.10
What is meant by the statement that a laser beam is coherent monochromatic and parallel?

Conceptual question 19.11
What are laser knives?


Conceptual question 19.12
Why we cannot see atom?

Conceptual question 19.13
What is meant by braking radiation?

Conceptual question 19.14
What is optical pumping?