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. What is the wavelength of the wave that is required to ionize the hydrogen atom?
. What can be the wavelength of the emitted photon when the electron enters another energy state?
and a once ionized helium atom 
have one outer electron. We knock out this one outer electron in each of them using some energy.
is an electron in the ground state with an energy of 
. The first three excited states have 
, 
and 
, respectively. Determine the state of the electron after it absorbs a photon with a wavelength of 
. Can this excited electron emit visible light?
, 
, 
, 
, 
and 
.
?
)
. What does ionization energy mean and how much is it in this case? Choose the correct explanation and the correct value from the list below:
.
.
. This is the energy needed to knock an outer electron in the ground state out of the sodium atom. Sodium ion 
is obtained in the transition of an outer electron from the first excited state to the ground state alongside light with a wavelength of 
. What kind of light do we need to ionize a sodium atom that has an outer electron in the first excited state?
, 
, 
, 
and 
. In a once ionized helium atom 
, however, the remaining electron has an energy of 
in the ground state. Calculate by what factor the energies of the ground states of the two atoms differ.
)
to the first excited state?
.
. The speed of light is 
, the Planck constant 
.
, 
, 
, 
... An electron is in the third excited state, what are the possible wavelengths of the emitted photon when the electron transitions to a lower state?
)
and 
and 
.
, 
, 
, 
, 
, 
