A string long and fixed at its ends is driven by a vibrator. The string vibrates in its Fifth harmonic mode. The speed of the wave and its fundamental frequency
54Hz
56Hz
57Hz
58Hz
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50 mL of 0.2 M ammonia solution is treated with 25 mL of 0.2 M HCl. If pKb of ammonia solution is 4.75, the pH of the mixture will be : Option: 1 3.75 Option: 2 4.75
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