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Chapter 22: Heat Transfer Questions
Chapter 22: Heat Transfer Questions
22
Physics
01/03/2012

Term
 Metals are good ___________________.
Definition
 conductors
Term
 Wood is a good ____________________.
Definition
 insulator
Term
 There are three forms of Heat Transfer. Name them and give examples.
Definition
 Convection (wind over ocean), Conduction (pan on electric stove), Radiation (Sun to Earth)
Term
 Iron is a good absorber and a _____________ emitter.
Definition
 good. Good absorbers are good emitters. Poor absorbers are poor emitters.
Term
 An insulator is an object which delays the transfer of _______________.
Definition
 heat
Term
 If you hold one end of an iron rod in a flame and touch the far end with your hand. You will eventually feel heat. How was the heat transferred?
Definition
 conduction
Term
 Materials that _________ heat well through direct contact are called good conductors.
Definition
 transfer
Term
 When you touch a piece of wood, and a piece of metal, which one feels colder? Explain.
Definition
 The metal, because it is the better conductor. Heat is moving from your hand into the metal making the metal “feel” cooler
Term
 __________is defined as the absence of “ heat.”
Definition
 Cold
Term
 When heat is transferred by ______________ in a fluid it is called convection.
Definition
 currents
Term
 Energy that is transmitted in the form of electromagnetic waves is called _______________________________.
Definition
Term
 Any energy that is transmitted by radiation is a form of ______________________ energy.
Definition
Term
 All objects continually _______ radiant energy in a mixture of _________.
Definition
 emitwavelengths
Term
 Objects at low temperatures emit ____________ wavelengths of radiant energy.
Definition
 long
Term
 Objects at __________ temperatures emit radiant energy with short wave lengths.
Definition
 high
Term
Definition
 little, think of pupils of the eye.
Term
 Good absorbers of radiant energy are also good __________.
Definition
 emitters. A dark object that absorbs a lot must emit a lot as well. Think of the retina of the eye….it emits the information into the Optic Nerve
Term
 Give me an equation for: Newton’s Law of Cooling.
Definition
 rate of cooling ≈ ∆T
Term
 To understand the greenhouse effect you need to know two things. Name them.
Definition
 1.) All things radiate with a wavelength dependent on the temperature of the object. 2.) Transparency of an object depends on the radiation they are receiving.
Term