Class 9 Exam > Class 9 Questions > Statement A: Molecules also move from one pla...
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Statement A: Molecules also move from one place to another in wave motion.
Statement B: Electromagnetic waves don’t need material medium to travel.
Which of the two statement is true
Statement B: Electromagnetic waves don’t need material medium to travel.
Which of the two statement is true
- a)Neither A or B
- b)Statement B
- c)Statement A
- d)Both A and B
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Statement A: Molecules also move from one place to another in wave mot...
Wave motion is activity that carries energy from one place to another without actually moving any matter.In wave motion, energy—the ability to perform work, or to exert force over distance—is transmitted from one place to another without actually moving any matter along the wave. In some types of waves, such as those on the ocean, it might seem as though matter itself has been displaced; that is, it appears that the water has actually moved from its original position. In fact, this is not the case: molecules of water in an ocean wave move up and down, but they do not actually travel with the wave itself. Only the energy is moved.
Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
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Statement A: Molecules also move from one place to another in wave mot...
Understanding the Statements
When analyzing the two statements, it's essential to grasp the concepts behind them.
Statement A: Molecules and Wave Motion
- Molecules in a medium do exhibit motion, but this is typically described as translational, rotational, or vibrational rather than wave motion.
- In wave motion, such as sound waves, the disturbance travels through the medium while the molecules oscillate about their equilibrium positions.
- Thus, Statement A misrepresents the nature of molecular motion in the context of wave phenomena.
Statement B: Electromagnetic Waves
- Electromagnetic waves, such as light, radio waves, and X-rays, do not require a medium to propagate.
- They can travel through the vacuum of space, demonstrating that they can transmit energy without the need for molecules or particles.
- This characteristic is fundamental to the understanding of electromagnetic theory and is well-supported by experimental evidence.
Conclusion: Why B is Correct
- Given the explanations above, Statement B is accurate while Statement A is misleading.
- Therefore, the correct answer is option 'B', affirming the truth of Statement B regarding electromagnetic waves.
Key Takeaway
- Electromagnetic waves can travel in a vacuum.
- Molecular motion in wave contexts is not accurately described as wave motion.
In summary, understanding the nature of waves and the requirements for their propagation is crucial in distinguishing between the two statements.
When analyzing the two statements, it's essential to grasp the concepts behind them.
Statement A: Molecules and Wave Motion
- Molecules in a medium do exhibit motion, but this is typically described as translational, rotational, or vibrational rather than wave motion.
- In wave motion, such as sound waves, the disturbance travels through the medium while the molecules oscillate about their equilibrium positions.
- Thus, Statement A misrepresents the nature of molecular motion in the context of wave phenomena.
Statement B: Electromagnetic Waves
- Electromagnetic waves, such as light, radio waves, and X-rays, do not require a medium to propagate.
- They can travel through the vacuum of space, demonstrating that they can transmit energy without the need for molecules or particles.
- This characteristic is fundamental to the understanding of electromagnetic theory and is well-supported by experimental evidence.
Conclusion: Why B is Correct
- Given the explanations above, Statement B is accurate while Statement A is misleading.
- Therefore, the correct answer is option 'B', affirming the truth of Statement B regarding electromagnetic waves.
Key Takeaway
- Electromagnetic waves can travel in a vacuum.
- Molecular motion in wave contexts is not accurately described as wave motion.
In summary, understanding the nature of waves and the requirements for their propagation is crucial in distinguishing between the two statements.
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Statement A: Molecules also move from one place to another in wave motion.Statement B: Electromagnetic waves don’t need material medium to travel.Which of the two statement is truea)Neither Aor Bb)Statement Bc)Statement Ad)Both A and BCorrect answer is option 'B'. Can you explain this answer?
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