List of top Physics Questions on Types of Waves

Polarisation of light proves that light waves are:

For a travelling harmonic wave $y(x, t) = 2.0 \cos 2\pi(10t – 0.0080 x + 0.35)$, where $x$ and $y$ are in cm and $t$ in s. The phase difference between oscillatory motion of two points separated by a distance of 0.5 m is: ____.

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is