اذا كان البعد بين أقصى نقطتين يصل اليهما الجسم المهتز يساوي 4cm فأن سعة الحركة لهذا الجسم بوحدة cm تساوي

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up