Rutherford’s α -particle experiment showed that atoms have

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12.Atoms

easy

Rutherford’s $\alpha$-particle experiment showed that the atoms have

Proton

Nucleus

Neutron

Electrons

Solution

(b) In Rutherford's alpha particle experiment, the scattered alpha particle has large deflection angles. This experiment showed that the positive matter of atom was concentrated in an very small volume and it gave the idea of nucleus of an atom.

Standard 12

Physics

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about $10^{-40} .$ An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction.

medium

The energy of hydrogen atom in $n^{th}$ orbit is $E_n$, then the energy in $n^{th}$ orbit of singly ionised helium atom will be

normal

An $\alpha$-particle of energy $4\ MeV$ is scattered through $180^o $ by a fixed uranium nucleus. The distance of the closest approach is of the order of

medium

The first line in the Lyman series has wavelength $\lambda $ . The wavlength of the first line in Balmer series is