Heat and Energy Review

A metal block (A) with a temperature of 25°C is placed on top of another identical metal block (B) with a temperature of 38°C. Which of the following is most likely to occur as soon as you place block A on top of block  B?

• žThermal energy will be transferred from block A to block B.
• žBoth blocks will remain at the same initial temperature.
• The temperature of block B will increase
• Thermal energy will be transferred from block B to block A. 

Jairo likes ice cream with hot fudge.
He placed the spoon that he used to serve the ice cream into the jar with hot fudge and left it on the table. Which of the following best describes the final temperature of the spoon?

• žThe final temperature of the spoon will be higher than the initial temperature of the hot fudge.
• The final temperature of the spoon will be lower than the final temperature of the hot fudge
• žThe final temperature of the spoon will be higher than the final temperature of the hot fudge.
• žThe final temperature of the spoon will be the same as the final temperature of the hot fudge.

How does heat transfer between objects?

• žHeat transfers between objects in all directions.   
• žHeat transfers from warm objects to cold objects.   
• žHeat transfers from cold objects to warm objects.   
• žHeat transfers upwards and never stops flowing. 

Which graph best shows the flowing of heat between a cold and a warm object?

• A
• B
• C
• D

From the following situations indicate the one with the largest heat exchange.

• žA. Heat Flow žice cream     T=   2°C žoutside air    T= 34°C
• žHeat Flow žhot cocoa     T= 65°C žhot milk         T= 65°C
• Heat Flow žkitchen         T= 40°C žfridge with door opened T=   1°C
• žHeat Flow žporch                   T= 42°C žliving room         T= 39°C

Electromagnetic  Spectrum is made up from waves of different wavelengths in this order: microwaves, x-rays, infrared, radio waves, ultraviolet rays, gamma rays, visible light.   

• TRUE
• FALSE

Wavelengths are measured from peak to peak of a wave-frequencies are measured how many peaks they are in 1 sec of time measured . 

• TRUE
• FALSE

Thermal energy of objects at same temperature is not always the same as their temperature.

• True, thermal energy also depends on the mass of the object.
• False, thermal energy is always the same as the temperature.

Thermal energy can be transferred from one object to another to another in form of heat energy.

• TRUE
• FALSE

When a metal spoon with a temperature of 20 degrees Celsius is placed into a cup of water with temperature of 90 degree Celsius the spoon will heat up, this is an example of: 

• Radiation
• Conduction
• Convection
• Conjugation