Two coherent sources: crests, troughs and the lines of maximum and zero disturbanceदो कला-संबद्ध स्रोत: शृंग, गर्त, अधिकतम और शून्य विक्षोभ की रेखाएँTwo coherent sources: crests, troughs and the lines of maximum and zero disturbance

NCERT Fig 10.8, 10.10 · Class 12 Physics · Chapter 10 · interactive diagram

Parts and what they mean

• Coherent sources S₁, S₂ (कला-संबद्ध स्रोत S₁, S₂) — Like two needles moving up and down together in water: the phase difference between their waves at any point does not change with time.
• Separation d (दूरी d) — Distance between the two sources.
• Crests and troughs (शृंग और गर्त) — Solid circles = crests, dashed = troughs, at one instant.
• Antinodal lines (constructive) (प्रस्पंद रेखाएँ (संपोषी)) — Points where S₁P ~ S₂P = 0, λ, 2λ, … — waves arrive in phase, amplitude 2a, intensity 4I₀. Computed curves (hyperbolas).
• Nodal lines (destructive) (निस्पंद रेखाएँ (विनाशी)) — Points where S₁P ~ S₂P = λ/2, 3λ/2, … — crest meets trough, displacement zero.
• Point P on the bisector (समद्विभाजक पर बिंदु P) — S₁P = S₂P, so waves arrive in phase: y = 2a cos ωt, I = 4I₀.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 10.8, 10.10. Report a mistake