Sound as compressions and rarefactionsध्वनि — संपीडन और विरलन

NCERT Fig 10.9, 10.12 · interactive diagram

Parts and their functions

• Oscillating piston (source) (दोलन करता पिस्टन (स्रोत)) — Forward stroke squeezes air (compression); backward stroke spreads it (rarefaction).
• Compression (C) (संपीडन (C)) — Region where particles are crowded — density higher than average.
• Rarefaction (R) (विरलन (R)) — Region where particles are spread out — density lower than average.
• Direction of propagation (संचरण की दिशा) — C and R move forward; the particles do not travel with the wave — energy is carried.
• Particle vibration (कण का कंपन) — Each particle only oscillates about its mean position, parallel to the wave → longitudinal wave.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 10.9, 10.12. Report a mistake