Question

the amount of heat that is needed to raise the temperature of 1 kg of a material by 1°c is called the ____ of the material.
state
temperature
specific heat
charge
multiple choice 5 points
fast food restaurants keep food hot with infrared lamps. the heat is transferred to the food by ____.
convection
radiation
conduction

Explanation:

First Question (Multiple Choice)

To solve this, we recall the definitions:

• "State" refers to the physical form (solid, liquid, gas), not heat - related.
• "Temperature" is a measure of hotness/coldness, not the heat needed to change it.
• "Specific heat" is defined as the heat required to raise the temperature of 1 kg of a substance by \(1^\circ\text{C}\).
• "Charge" is related to electricity, not heat.

So the correct option is the one with "specific heat".

We analyze heat transfer methods:

• "Convection" involves fluid (liquid/gas) movement.
• "Radiation" is heat transfer via electromagnetic waves (like infrared from lamps).
• "Conduction" requires direct contact.
• "Condensation" is a phase change, not heat transfer for heating food.

Infrared lamps emit electromagnetic waves, so heat is transferred by radiation.

Answer:

C. specific heat

Second Question (Multiple Choice)