Physics
1.
This question is about lasers. (a) With reference to the light waves emitted by a laser, state what is meant by the terms (i) monochromatic. ........................................................................................................................... ...........................................................................................................................
(1)
(ii)
coherent. ........................................................................................................................... ...........................................................................................................................
(1)
(b)
The diagram (not to scale) shows three of the energy levels of a substance used to produce laser light.
The energy of the ground state is E0.
(i)
State what is meant by population inversion. ........................................................................................................................... ........................................................................................................................... ...........................................................................................................................
(1)
(ii)
Draw an arrow on the diagram to indicate the transition that results in a population inversion. Label the arrow P.
(1)
IB Questionbank Physics
1
(iii)
Draw an arrow on the diagram to indicate the transition that results in a pulse of laser light. Label the arrow L.
(1)
(iv)
Deduce that the wavelength of the emitted laser light is 690 nm. ........................................................................................................................... ...........................................................................................................................
This question is about lasers. (a) With reference to the light waves emitted by a laser, state what is meant by the terms (i) monochromatic. ........................................................................................................................... ...........................................................................................................................
(1)
(ii)
coherent. ........................................................................................................................... ...........................................................................................................................
(1)
(b)
The diagram (not to scale) shows three of the energy levels of a substance used to produce laser light.
The energy of the ground state is E0.
(i)
State what is meant by population inversion. ........................................................................................................................... ........................................................................................................................... ...........................................................................................................................
(1)
(ii)
Draw an arrow on the diagram to indicate the transition that results in a population inversion. Label the arrow P.
(1)
IB Questionbank Physics
1
(iii)
Draw an arrow on the diagram to indicate the transition that results in a pulse of laser light. Label the arrow L.
(1)
(iv)
Deduce that the wavelength of the emitted laser light is 690 nm. ........................................................................................................................... ...........................................................................................................................