#### Video lectures

Access over 500+ hours of video lectures 24*7, covering complete syllabus for JEE preparation.

#### Online Support

Practice over 30000+ questions starting from basic level to JEE advance level.

#### National Mock Tests

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.

#### Organized Learning

Proper planning to complete syllabus is the key to get a decent rank in JEE.

#### Test Series/Daily assignments

Give tests to analyze your progress and evaluate where you stand in terms of your JEE preparation.

Atomic Physics

• 1
• 2
• 3
• 4

#### Q. An electron with kinetic energy 5 eV is incident on a hydrogen atom in its ground state. The collision?

5eV electron cannot excite a hydrogen atom Hence collision is elastic.

#### Q. what is the difference between thomson and rutherford model?

Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup." Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus.

#### Q. Wherever hydrogen atom emits a photon in Balmer series?

n = 2 to n = 1 transition will take place

#### Q. what is braggs equation?

Bragg Equation. Because electrons have wave properties they can be diffracted by crystals. Electrons will be diffracted when the angle of incidence, θ on a crystal plane satisfies the Bragg Equation: nλ = 2 d sin θ where λ is the wavelength of the electrons, d is the spacing of the crystal planes and n is an integer.

#### Q. The frequency and intensity of a light source are both doubled. Consider the following statements. (i) The saturation photocurrent remains almost the same. (ii) The maximum kinetic energy of the photoelectrons is doubled.?

Saturation currect doubles and maximum k.e. increases but no doubles.