2. A string 2.0 m long and fixed at its ends is driven by a 240 Hz vibrator. The string vibrates in its third harmonic mode. The speed of the wave and its fundamental frequency is (Main 2019, 9 April II) (b) 320 m/s, 80 Hz (d) 180 m/s, 120 Hz (a) 180 m/s, 80 Hz (c) 320 m/s, 120 Hz
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