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অগ্রগামী তরঙ্গ (progressive wave) - এর রাশিমালা -

E = 2 π^{2} a^{2} f ρ

E = 2 π^{2} a^{2} f ρ^{2}

E = 2 π^{2} a^{2} f^{2} ρ

E = 2 π^{2} a^{2} f^{2} ρ^{2}

ANS : 3

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