Quiz on unit 5

Thermal radiation has a … spectrum

• line

• continuous

• invisible

• no correct answer

The energy of electron outside the hydrogen atom is … energy

• positive

• negative

Calculate the shortest wavelength in Balmer series then find the frequency of this radiation. given that

{R_H = 109677.6 cm ^-1 , V_light = 3 x 10⁸ m/s}.

The black body is .............

The Thomson model of the atom announce that the atom is like a solid ball which elastic, smooth and small.

• True

• false

The fist model of the atom is.......

• Bohr's model.

• Rutherford's model.

• Thomson's model

• Dalton's model

The modern physics deal with ....

• the natural phenomena of the seen system.

• the behavior of particles and microsystems.

• mechanics

• thermodynamic and electromagnetic.

The ionizing energy of hydrogen is......

• • -3.4 e.v

• +13.6 e.v

• -1.5 e.v

• -13.6 e.v

It is the group of spectral lines its wave length is very long, so it is in the far IR region.

• Lyman series

• Balmer series

• Paschen series

• Brackett series

The third orbit for electron in the hydrogen atom divided into .... orbits.

• two

• three

• four

• five