Test how many minutes exposure and at what time of day the exposure occurs to see whether these variables matter in the ability of UV light to damage yeast cell growth. Set up a table like the one below and record your experimental conditions and your observations. You can store extra plates in the fridge in a tightly closed plastic bag for a couple of months. At this position the shadow cast by the dish will be largest. A card placed under the plate will help to show the shadow.
Many products make claims that they protect people from the effects of UV light.
Design experiments that will test the claims of these products. Lip balms Tanning lotion Fabrics 3. Test tanning beds to see if they screen out harmful UV rays found in sunlight.