PROBLEM SOLVING 1 o A boy run 5 km due west and then return back to
travel a further distance of 4 km before resting. The
whole journey takes 1 hour. Calculate
his total distance travelled,
• his average speed,
• his displacement from the starting point,
• his average velocity.​

This is because as we know the magnitude of a forward voltage drop depends on the material used for constructing the diode and also the magnitude of the band gap, so since LED material are generally gallium arsenide and gallium phosphide which has the higher band gap than silicon and since the higher the band gap the higher the voltage drop so LED has the greater forward voltage drop then the silicon diode