Question

Assertion A: Radiation is the quickest mode of heat transfer.
Reason R: Electromagnetic waves penetrate into the object.
In light of the above statements, choose the correct answer from the options given below:

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is NOT the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Hint:

Radiation does not require a medium for heat transfer.
It travels at the speed of light.
Penetration depends on the material's properties.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
There are three modes of heat transfer: conduction, convection, and radiation.
Radiation is the transfer of heat through electromagnetic waves.

Step 2: Key Formula or Approach:
No specific formula.
Need to understand the characteristics of radiation.

Step 3: Detailed Explanation:
Radiation is the quickest mode of heat transfer because it travels at the speed of light.
Thus, Assertion A is true.
However, electromagnetic waves do not necessarily penetrate into the object.
They can be absorbed, reflected, or transmitted depending on the object's properties.
So, Reason R is false.

Step 4: Final Answer:
A is true but R is false.
Hence, the correct option is (C).