MNSR22

Question 1

DEFINE TEMPERATURE

Answer 1

• A property that indicates hotness or coldness of the object
• Related to Kinetic Energy

Question 2

DEFINE HEAT

Answer 2

• internal energy that flows as a result of temperature differences

Question 3

INTERNAL ENERGY (dependent variables) AND K.E. FORMULA

Answer 3

• Internal energy depends on temperature and mass

- KE=(1/2)MV^2=(3/2)KT

Question 4

TEMP-MASS-INTERNAL ENERGY RELATIONS

Answer 4

• High temperature but small mass hence small internal energy
• Low temperature but big mass hence large internal energy

Question 5

HOW DOES INTERNAL ENERGY FLOW

Answer 5

• internal energy always flows from hot body to cold body

Question 6

SAME T BUT DIFFERENT AMOUNTS OF HEAT ENERGY

Answer 6

Meaning higher no. of molecules

Question 7

WHAT 2 PHENOMENON ARE OBSERVED WHEN HEAT MOVES INTO A SUBSTANCE

Answer 7

• The substance can experience a raise in temperature
• Heat gain can increase temp
• Heat loss can decrease temp (taking heat away)
• Heat transfer also causes phase changes (eg melting boiling etc)

Question 8

Explain the mechanism of Heat Flow

Answer 8

• heat always flows from hot to cold until common temperature is reached
• regions of High T to regions of Low T

Question 9

Heat Units

Answer 9

• cal - calories
• defined as amount of heat necessary to raise a temp of 1g of water by 1 degree celsius
• 1cal = 4.186 joules

Question 10

Temperature Units

Answer 10

• SI is kalvin
• C and F also used
• these are based on freezing and melting point

Question 11

Charles Law

Answer 11

As volume increases temperature increases at constant pressure
at -273 degrees celsius there is zero volume (absolute zero of temperature)

Question 12

Scale Conversions for K C F

Answer 12

• T(K) = T(C) + 273
• T(C) = T(K) – 273.15
• T(F) = (9/5)T(C) + 32

Question 13

Freezing point and Boiling points and Absolute Zero for T C F

Answer 13

K = (ABS zero=0) (F.point=273) (B.point= 373)
C = (ABS zero = -273) (F.point=0) (B.point=100)
F = (ABS zero = -459.7) (F.point=32) (B.point=212)

Question 14

Define thermometers

Answer 14

• instruments based on a change in some physical characteristic which is used to measure temperature

Question 15

Thermometric Properties

Answer 15

• Thermal expansion
• e.m.f of a thermocouple
• Pressure of a gas at a constant volume
• Volume of a gas at constant pressure
• resistance
• colour

Question 16

List types of thermometers

Answer 16

• Mercury thermometer
• bimetallic strip
• ## IR radiation thermometer