Consider Young's experiment set-up that is formed of two very
thin parallel slits Fi and F2, separated by a distance a = 1 mm ,
and a screen of observation (E) placed parallel to the plane of
the slits at a distance D = 2 m from the mid point I of F1F2 and a
thin slit F, equidistant from Fi and F2, situated on the straight
line (A) whose intersection with (E) is the point O.
The object of this exercise is to study the interference pattern
observed on the screen (E) in different situations.
(4)
A- First situation
The slit F is illuminated with a monochromatic light of wavelength 2 = 0.64 um in air.
1) Describe the interference pattern observed on (E).

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

a.   mass number from atomic number