The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground is 760 mmHg, the pressure at a height of 20km above ground level is
480 mmHg
570 mmHg
190 mmHg
380 mmHg
If in a simple pendulum experiment, the length of the inextensible string is increased by a factor of four, its period is increased by a factor of
444
π2\frac{\pi}{2}2π
14\frac{1}{4}41
2
Which of the following waves is not mechanical?
Waves in pipes
Water waves
Radio waves
Sound waves
Which of the following is a characteristic of stationary waves?
The antinode is a point of minimum displacement
The distance between two consecutive nodes is one wavelength
They can be transverse or longitudinal
They are formed by two identical waves travelling in opposite directions
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