Sun screen lotion reduces your skin's ability to produce____by up to 95%

True or false .If false gie the correct answer. Sun screen lotion reduces ability to produce Vitamin D. It leads to Vitamin D deficiency diseases.

Sun Screen lotion is not good for our health justify.

Study the figures given below and answer the questions. Which type of cross produces higher recombinant percentage ? Give reason in support of your answer.

If a machine is correctly set up, it produces 90% acceptable items. If it is incorrectly set up, it produces only 40% acceptable items. Past experience shows that 80% of the set ups are correctly done. If after a certain set up, the machine produces 2 acceptable items, find the probability that the machine is correctly set up.

An image of the sun is formed on the metal surface of the photoelectric cell and it produces of current. The lens forming the image is then replaced by another of the same diameter but only half in focal length. a. What will be the effect on the photoelectric current? b. Is photoelectric emission possible at all frequencies ? c. If not give your explanation.

An electric lamp and a candle produce equal illuminance at a photometer screen when they are placed at 80 cm and 20 cm from the screen respectively. The lamp is now covered with a thin paper which transmits 49% of the luminous flux. By what distance should the lamp be moved to balance the intensities at the screen again ?