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Speed and velocity may seem like identical measures but this is not the case. Speed is a scalar measurement meaning it only takes into account magnitude not direction, velocity is a vector quantity and...

Imagine a following situation: a stationary (not moving) object with a mass of 5 kg is suspended in the air by two strings. The angles between strings and the vertical directions are 15 and 55 degrees. Wh...

A scalar is a quantity that has only magnitude (size)
E.G Distance, Speed, Temperature
A vector is a quantity that has magnitude and a direction.
E.G Displacement, Velocity, Change in Tempe...

The key equation is that of the energy of a photon.

E = hc/λ​ 

Using λ​ = 550nm gives E = 3.61x10^-19...