Question

#5. A standing sound wave in a pipe has five
displacement nodes and five antinodes. The
harmonic number of vibrations, is
(1) 3
(2) 4
(3) 5
(4 9​

Answer 1

Answer:

5

Explanation:

5 is the correct answer

Answer 2

The correct answer is : (3) 5.

Explanation:

• Sound exhibit the following properties:

1. It requires any medium to propagate, solid, liquid or gas. It travels fastest in solid.
2. It moves like a  longitudinal wave in which the molecules vibrate in a direction which is parallel to the direction of motion of the wave.
3. It forms compressions (high molecular density) and rarefactions (low molecular density) in the medium through which it pass.

• In the question, the nodes and anti-node represents the crest and trough of a wave respectively.
• A wave is formed by one crest and one trough, that is, one node and one anti-node.
• A single wave also represents a single vibration.
• According to the question, there are five nodes and five anti-nodes. This will give rise to five waves.
• Five waves means five vibrations.