Question

Following are two lists, list-I contains the types of electromagnetic waves and list-II contains theirs source. Match the entries from list-I to appropriate entries from list-II.

• A. (a)\(\rightarrow\)(r), (b)\(\rightarrow\)(q), (c)\(\rightarrow\)(s), (d)\(\rightarrow\)(q)
• B. (a)\(\rightarrow\)(p), (b)\(\rightarrow\)(s), (c)\(\rightarrow\)(r), (d)\(\rightarrow\)(q)
• C. (a)\(\rightarrow\)(s), (b)\(\rightarrow\)(p), (c)\(\rightarrow\)(q), (d)\(\rightarrow\)(s)
• D. (a)\(\rightarrow\)(s), (b)\(\rightarrow\)(p), (c)\(\rightarrow\)(r), (d)\(\rightarrow\)(q)

Hint:

Remembering the order of the electromagnetic spectrum (Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma ray - "Raging Martians Invaded Venus Using X-ray Guns") and a key source/application for each type is very helpful for such questions.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
This is a matching question where we need to pair different types of electromagnetic (EM) waves with their common sources of production.
Step 2: Key Formula or Approach:
This question is based on factual knowledge about the electromagnetic spectrum and the production mechanisms for different types of EM waves. We need to recall the source for each wave type.
Step 3: Detailed Explanation:
Let's analyze each type of wave from List-I and find its source in List-II.
\begin{itemize} \item (a) X-rays: These are high-energy photons produced when fast-moving electrons are suddenly decelerated by hitting a metal target. This directly corresponds to option (s) Fast moving electrons striking a metal plate. So, (a)\(\rightarrow\)(s).
\item (b) Infrared rays: These are also known as heat waves. They are produced by the vibration and rotation of atoms and molecules in hot bodies. This matches with option (p) Hot bodies and molecules. So, (b)\(\rightarrow\)(p).
\item (c) Microwaves: These are short-wavelength radio waves. A common device used to generate microwaves is a magnetron, which is used in microwave ovens. This matches with option (r) Magnetron. So, (c)\(\rightarrow\)(r).
\item (d) Radio waves: These are produced by the acceleration of charges in conducting wires. Specifically, they are generated by oscillatory currents in LC circuits which are then radiated by antennas. This corresponds to option (q) Oscillatory current in antennas. So, (d)\(\rightarrow\)(q).
\end{itemize} Combining these matches, we get: (a)\(\rightarrow\)(s), (b)\(\rightarrow\)(p), (c)\(\rightarrow\)(r), (d)\(\rightarrow\)(q). This combination matches option (D).
Step 4: Final Answer:
The correct matching is (a)\(\rightarrow\)(s), (b)\(\rightarrow\)(p), (c)\(\rightarrow\)(r), (d)\(\rightarrow\)(q).