Which wavelength will be emitting by a sample of atomic hydrogen gas (in ground state) if electron of energy `12.5eV` collide with the atoms of the gas?

A particular hydrogen like atom has its ground state Binding energy = 122.4 eV . It is in ground state. Then

Energy of H-atom in the ground state is -13.6eV . Hence energy in the second excited state is

When a hydrogen atom is excited from ground state to first excited state then

When a hydrogen atom is excited from ground state to first excited state then

The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a He+ ion in the first excited state will be .....

The energy of hydrogen atom in its ground state is -13.6 eV . The energy of the level corresponding to the quantum number n = 5 is

U.V . light of wavelength 800A^(@)&700A^(@) falls on hydrogen atoms in their ground state & liberates electrons with kinetic energy 1.8eV and 4eV respectively. Calculate planck's constant.

Monochromatic radiation of wavelength lambda are incident on a hydrogen sample in ground state. Hydrogen atoms absorb the light and subsequently emit radiations of 10 different wavelength . The value of lambda is nearly :

A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2 eV. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15eV. What wil be observed by the detector? (a) 2 photons of energy 10.2 eV (b) 2 photons of energy 1.4 eV (c ) One photon of energy 10.2 eV and an electron of energy 1.4 eV (d) One photon of energy 10.2 eV and another photon of energy 1.4 eV

Electromagnetic waves of wavelenglth 1242 Å are indicdent on a metal of work funcation 2eV . The target metal is connected to a 5 volt cell, as shown. The electrons pass through hole A into a gas of hydrogen atoms in their groynd stte. Find the number of spectral lines emitted when hydrogen atoms come back to their froynd states after gaving veen excited by the electrons, Assume all excitations in H-atoms from ground state only ( hc = 12420 eVÅ )