Newton = kg·m/s², derived from base units. Kilogram, second, candela are base units. Derived units expressed in terms of base units. Joule, watt, pascal are also derived.
Explanation:
Sound waves in air are longitudinal, particles vibrate parallel to wave propagation. Light and radio are electromagnetic, transverse. Waves on a string are transverse. In fluids, only longitudinal mechanical waves can propagate.
Explanation:
In Einstein's photoelectric theory, electrons are bound to the metal lattice. The 'work function' (often denoted by Phi or W) is defined strictly as the absolute minimum thermodynamic work (energy) needed to overcome these binding forces and remove an electron from the surface into a vacuum. If incident photon energy (hf) is less than the work function, absolutely no emission occurs.
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