19.) The intensity of dark fringe in the interface pattern becomes zero when two waves of light
a) aremonochromatic
b) are of same frequency
c) are of same amplitude
d) travel in opposite direction​

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?