50 POINTS light can bounce off objects this is called reflection it's what allows us to see objects although many light waves are hitting the paper and reflection from it showing just one ray helps us follow the path of a single wave hector shows the class a picture that models what happens as the students observe the blue construction paper when the flashlight is shining on it For each color of paper which part of white light is reflected?

sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach