A 100 ohm resistor and an unknown resistor are connected in series to a 10 volt battery if the potential drop across the 100 ohm resistor is 4 volts the resistance of the unknown resistor is answer

What occurs during a combustion reaction

The movement of electrons between atoms is called an

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?