Yes, a physical quantity can have magnitude and direction but still be a scalar if it doesn't obey the vector addition. An example is Electric Current which has magnitude and a fixed direction, but it does not follow vector laws of addition.
As we know that wave of sound is a mechanical wave and its speed is given by
v = (γRT/M)
whereas the wave of light is an electromagnetic wave and its speed is given by
c = (1/εoμo)
So speed of sound depends on temperature of air but speed of light doesn't.
Materials show varying behaviors based on their Poisson's ratio. High Poisson's ratio materials (near 0.5) contract significantly sideways when stretched and expand when compressed, seen in substances like rubber. Low Poisson's ratio materials (near 0) undergo minimal width change during axial deformation, typical of metals and common engineering materials.
If vectors are arranged as trigonal planar and have equal magnitude, it is an ideal case of zero resultant.
