Atoms Test - 47...

The photon energy in units of eV for electromagnetic waves of wavelength $$2 cm$$ is:

An electron with energy $$12.09$$ eV strikes hydrogen atom in ground state and gives its all energy to the hydrogen atom. Therefore hydrogen atom is excited to __________ state.

The radius of second orbit in an atom of hydrogen is R. What is the radius in third orbit.

In the geiger-marsden experiment what percentage of the $$\alpha$$ particles were deflected by an angle more than $$1^o$$.

What is alpha-particle?

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by

If the series limit of the Balmer series for hydrogen is 2700 Angstrom. Calculate the atomic no. of the element which gives X-ray wavelength of $$K_\alpha$$ line as 1.0 Angstrom.

Cathode rays were discovered by

The ionization energy of a hydrogen like Bohr atom is $$4$$ Rydbergs. (i) What is the wavelength of the radiation emitted when an electron jumps from the first excited state to the ground state? (ii) What is the radius of the first orbit for this atom?

A double ionized lithium atom is hydrogen-like with atomic number $$3$$.
(a) Find the wavelength of the radiation required to excite the electron in $$Li++$$ from the first to the third Bohr orbit. (Ionization energy of the hydrogen atom equals $$13.6\ eV$$)\
(b) How many spectral lines are observed in the emission spectrum of the above excited system?