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This problem can be solved by first considering the energy of a photon e = hf. ​A photon of red light lacks the sufficient energy to free an electron. However a photon of blue light has a higher frequency...

A.C. stands for alternating current, and the current constantly changes direction. D.C. stands for direct current, and the current only flows in one direction.

Use the equation p= m x v , where p=momentum m=mass (kg) and v=velocity (m/s)p= 84x5 = 420 kg m/s

Waves are a way that energy is transferred from one place to another. There are two main types of wave, Transverse and Longitudinal. In both types of wave, energy is transferred in one di...

Work done (joules) = Force (newtons) x distance moved in direction of the force (metres)

Work done = 10 x 2 = 20J