NABTEB, PHYSICS THEORY, OBJECTIVE, QUESTIONS AND ANSWERS-2012

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Q2a. Define the boiling point of a liquid.
2b Describe wit the aid of a labelled diagram, an experiment to determine the boiling point of a small quantity of a liquid.
2c state 2 factors that may affect the boiling of a liquid.
2d using kinetic theory of matter,
explain why pure water changes to steam at s t p.
Witout any change in
temperature,
although heat is being supplied to the water.

Q5a Define photoelectric emission
5b Draw a labelled diagram showing the structure of a simple type of aa photo cell
and explain its mode of operation
5c state 4 application
of photoelectric emission.

5d in photocell, no electrons ar emitted until the threshold frequence of light is reached.
i.) explain wot hapens to the energy of the light b4 emission
of electrons begin.
ii) State one factor that may affect the number of emitted electrons.

NABTEB PHYSIC ANSWERS.
2a) The boiling point is the temperature at which the vapor pressure of a liquid equals the external pressure surrounding the liquid.
2bbpgraph

2c) equal to one atmosphere, the boiling point of a liquid is called the normal boiling point.
greater than one atmosphere, the boiling point of the liquid is greater than its normal boiling point.
The lower the pressure of a gas above a liquid, the
lower the temperature at which the liquid will boil.
5a) the release or absorption of quanta
above a certain energy level emission
OR
the release of electrons from parent atoms Based.

 NABTEB PHYSICS OBJECTIVE.
01-10 cddbccdcac
11-20 baccabacbc
21-30 adbbbacddc
31-40 cacabacaaa
41-50 aacadbddcb
NOTE: Not 100% guaranteed, please also read ahead.
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