Wave-particle duality tells us that wave and particle models apply to all objects whatever the size, so why don't we observe wave properties in macroscopic objects? because their particle properties forbid us from observing their wave properties. because their wavelength is extremely long (undetectable). because their wavelength is extremely short (undetectable).

The correct choice is Because their wavelength is extremely short (undetectable).

Wave particle duality is the concept in quantum physics that every particle or quantum may be partly described in terms not only of particles, but also of waves. Today, physicists accept the dual nature of light. They say that the light waves are actually packets of photons travelling closely. So on the basis of this concept we can consider particles as waves too but the wavelength of these waves are too short to be measured that is why we cannot observe wave properties in macroscopic objects

the components of a vector are the parts of the vectors that are to each other.

b perpendicular

the components of a vector are the parts of the vectors that are to each other.

b perpendicular