Q. The condition for sustained interference is

निरंतर हस्तक्षेप की शर्त है

Equal wavelength
समान तरंगदैर्घ्य

Same amplitude
समान आयाम

Constant phase difference
लगातार चरण अंतर

All of the above
ऊपर के सभी

For sustained (stable and visible) interference:

Waves must have equal or nearly equal wavelength
Must maintain a constant phase difference
Preferably similar amplitude for clear patterns
So, all three conditions are essential for a clear and continuous interference pattern.

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