TBR CBT 3 - Translational KE

[LuminousTruth]

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19) Which of the following processes involves the transfer of translational kinetic energy?

A. Conduction
B. Convection
C. Conduction and radiation
D. Convection and radiation

I am still confused with how the answer is "B".

I thought transduction of KE includes conduction and radiation. When an object is moving (have KE), it can transfer its energy to a stationary object by colliding with it by conduction. For example, transfer of momentum and KE in elastic collisions show this.

Also, in a scintillator (to measure radioactive decay), a particle with KE can collide with the walls of the scintillator. The walls take in that KE and release a photon with certain wavelength of light. The translational energy from the particles is transferred to forms of emitted light by the scintillator.

I am unsure why these two qualifications (choice D) is wrong and why convection is right? Can someone explain?

 

[LuminousTruth]

Anyone agree or disagree with the reasoning?

 

[Economics]

I missed the same question so you are not alone there. I also picked D. I cant remember what the explanation says. Care to post it?

 

[osprey099]

I think it should be D because liquids and gases have translational KE, not solids. Convection refers to transfer of charge via a medium (either liquid or gas) and radiation is light rays exciting a substance. The only reason I can think of that it might not be D is that radiation (light rays) might not be considered as gas particles?

 

[mr chievous]

19) Which of the following processes involves the transfer of translational kinetic energy?

A. Conduction
B. Convection
C. Conduction and radiation
D. Convection and radiation

I am still confused with how the answer is "B".

I thought transduction of KE includes conduction and radiation. When an object is moving (have KE), it can transfer its energy to a stationary object by colliding with it by conduction. For example, transfer of momentum and KE in elastic collisions show this.

Also, in a scintillator (to measure radioactive decay), a particle with KE can collide with the walls of the scintillator. The walls take in that KE and release a photon with certain wavelength of light. The translational energy from the particles is transferred to forms of emitted light by the scintillator.

I am unsure why these two qualifications (choice D) is wrong and why convection is right? Can someone explain?

Liquids have translational KE, as do gases (but not solids).

Radiation is not correct because it occurs in the absence of a medium. No medium = no gas particles = no transfer of translational kinetic energy.

B is correct.