Atoms, Nuclei &...

In Geiger-Marsden experiment very small deflection of the beam was expected because

Fluorescence is

Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?

It is found experimentally that for small thickness t, the number of α-particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide?

An electron collides with a hydrogen atom in its ground state and excites it to a state of n = 3. How much energy was given to the hydrogen atom in this inelastic collision?

Which of these statements correctly describe the atomic model according to classical electromagnetic theory ?

Reason why there are many lines in an atomic spectrum is because

In the ground state of which model electrons are in stable equilibrium with zero net force?

A triply ionized beryllium ion Be³⁺ , (a beryllium atom with three electrons removed), behaves very much like a hydrogen atom except that the nuclear charge is four times as great. For the hydrogen atom, the wavelength of the photon emitted in the n =2 to n=1 to transition is 122 nm. What is the wavelength of the photon emitted when a Be³⁺  ion undergoes this transition?

In Geiger-Marsden experiment, at the point of closest approach