Ep-1 what should you do if you suddenly find yourself in cold water?

Try to conserve heat as much as possible. This can be done by closing your arms tight to your torso and adopt the Heat Escape Lessening Position, or H.E.L.P, put your legs together and keep your head above water to keep it dry. Dot try to swim but hold onto a floating object and stay still and wait to be rescued  (if there is no nearby boat to reach to). Swimming can reduce your survival time by almost 50%.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.