WB JEE 2016

The vectors \(\overrightarrow A\) and \(\overrightarrow B\) are such that | \(\overrightarrow A\) + \(\overrightarrow B\) | = | \(\overrightarrow A\) \(-\) \(\overrightarrow B\) |. The angle between the two vectors will be

For Fraunhoffer diffraction to occur

For air at room temperature, the atmospheric pressure is 1.0 \(\times\) 105 Nm\(-\)2 and density of air is 1.2 kgm\(-\)3. For a tube of length 1.0 m, closed at one end, the lowest frequency generated is 84 Hz. The value of \(\gamma\) (rat...

The velocity of sound in air at 20\(^\circ\)C and 1 atm pressure is 344.2 m/s. At 40\(^\circ\)C and 2 atm pressure, the velocity of sound in air is approximately

Work done for a certain spring when stretched through 1 mm is 10 joule. The amount of work that must be done on the spring to stretch it further by 1 mm is