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in Physics by (25.2k points)
एक अप्रगामी तरंग की समीकरण `y = 2a sin (1000 t) cos (0.1 x)` है, जहाँ y, a मिमी में, t सेकंड में तथा x मीटर में है। इसे उत्पन्न करने वाली प्रगामी तरंगो की चाल है:
A. `10^(4)` मीटर/सेकंड
B. `10^(-4)` मीटर/सेकंड
C. 100 मीटर/सेकंड
D. 10 मीटर/सेकंड

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