Flashcards
Unit 1 Physics Thermodynamics
Cards in this deck (18)
- 1Convert temperature between Celsius and kelvin.C to K +273
K to C -273 - 2Describe the zeroth law of thermodynamics.if objects A and B are in thermal equilibrium with object C, then object A and B are also in thermal equilibrium.
Two bodies in contact with each other will reach thermal equilibrium. - 3Describe temperature with reference to the average kinetic energy of the atoms and molecules within a system.the more heat the more the particles vibrate
- 4Describe the first law of thermodynamics and state the equation.Energy simply changes from one form to another and the total internal energy in a system is constant
U=Q+W
U= change in internal energy
Q= energy added/taken away
W= work done by or on system - 5Describe conduction and how it occurs.conduction is the process of heat transfer within a material or between materials without the overall transfer of the substance itself. Heat is transferred by molecular collisions and free electrons.
- 6Describe convection and how it occurs.Convection is the transfer of a fluid within a fluid (gas or liquid).
Mass movement of particles within a system over a distance, warm fluid rising cool fluid falling. - 7Describe radiation and how it occurs.Any object whose temp. is above 0k emits thermal energy by radiation.
Transferred by means of electromagnetic waves.
Partially reflected, transmitted and absorbed. - 8What does the rate of emission or absorption depend on?Temperature difference between object and its surroundings.
Surface area and characteristics of object.
Wavelength of radiation. - 9Define 'specific heat capacity'.SHC is the amount of energy that must be transferred to change the temperature of 1kg of material by 1C/k.
- 10State the Specific Heat Capacity formula.Q=mc△T
Q= heat energy transferred in joules (J)
m= mass of material being heated in (kg)
△T change in temperature (C or k) - 11Define Latent heat (2).Latent heat of fusion is the amount of energy needed to change 1kg of of solid to melting point.
Latent heat of vaporisation is the amount of energy needed to change 1kg of of liquid to gas at its boiling point. - 12State the latent heat formula.Q=mL(fusion/vaporisation)
Q= heat energy transferred in joules (J)
m= mass in kilograms (kg)
L(fusion/vaporisation)= the latent heat of fusion/vaporisation in J kg^-1 - 13State the order of the Electromagnetic SpectrumGamma Rays
X-rays
Ultraviolet
Visible spectrum
Infrared
Microwaves
TV
Radio - 14What electromagnetic radiation is emitted from the sun?Ultraviolet, Visible spectrum and Infrared.
- 15State Wien's Lawit is: (peak) max T= 2 . 898 x 10^-3 m k
- 16What does the Stefan-Boltzmann Equation measure and what is the formula.The rate of transfer of radiant energy, calculated by:
P= power in watts
T= temperature of object in k
A= surface area of object
Constant (o) = 5.67 x 10^-8 Wm^-2 K^-4
e= emissivity of the surface
P= e (constant (o) ) T^4 - 17model the greenhouse effect as the flow and retention of thermal energy from the sun
- 18—
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- Victorian Certificate of Education (VCE) Physics (unit 1) Flashcards on Unit 1 Physics Thermodynamics, created by Kathryn Knowles on 16/05/2016.
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- Kathryn Knowles
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