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A wave moving in a gas...

A wave moving in a gas

A

must be longitudinal

B

may be longitudinal

C

must be transverse

D

may be transverse.

Text Solution

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The correct Answer is:
To determine the nature of a wave moving in a gas, we can analyze the characteristics of wave propagation in different mediums. Here’s a step-by-step solution: ### Step 1: Understand the Types of Waves Waves can be classified into two main types: longitudinal waves and transverse waves. - **Longitudinal Waves**: In these waves, the particle displacement is parallel to the direction of wave propagation. An example is sound waves in a gas. - **Transverse Waves**: In these waves, the particle displacement is perpendicular to the direction of wave propagation. An example is waves on a string or electromagnetic waves. ### Step 2: Analyze the Medium The question specifies that the wave is moving in a gas. It is important to note the properties of gases: - Gases have particles that are far apart compared to solids and liquids. - The particles in a gas can move closer together or further apart, which allows for compressions and rarefactions. ### Step 3: Determine the Type of Wave in a Gas Since gases can only support longitudinal waves due to the nature of particle movement: - **Longitudinal Waves**: These can travel through gases as they allow for compressions and rarefactions. - **Transverse Waves**: These require a medium where particles are closely packed (like solids) to transmit the wave, as the particles need to move perpendicular to the wave direction. ### Step 4: Conclusion Based on the analysis, the correct answer is that a wave moving in a gas should be **longitudinal**. Therefore, the answer is option A. ### Final Answer: **A wave moving in a gas should be longitudinal.** ---
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