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Physics
A string 25 cm long and having a mass of 2.5 g is under tension. A pipe closed at one end is 40 cm long. When the string is set vibrating in its first overtone and the air in the pipe in its fundamental frequency, 8 beats per second are heard. It is observed that decreasing the tension in the string decreases the beat frequency . If the speed of sound in air is 320 ms^-1 , find the tension in the string.
Chemistry
Multiple- Choice Question phenol gives salicyldehyde on heating with CHCl₃ and NaOH . It is known as (A) Cannizzaro reaction (B) Claisen reaction (C) Reimer-Teimann reaction (D) Hell - Volhard - Zelinsky reaction
Mathematics
If the vectors a, b and c form the side BC, CA and AB respectively of a triangle ABC , then (a) a . b + b .c + c .a = 0 (b) a x b = b x c = c x a (c) a. b = b .c = c.a (d) a x b + b x c + c x a = 0

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