40.The energy conversion efficieney of converting electricity to light energy in

Question

40.The energy conversion efficieney of converting electricity to light energy in an incandescent light bulb is A. 50% B. 100% C, 60% D. 5% E. 10% PART B- FREE RESPONSE. Write your answer on a separate sheet of paper. You MUST write in complete sentences. When calculations are required, show all your work. NO CALCULATORS. 1. According to some scientists, the Earth is currently undergoing a mass extinction in which large groups of existing species are being wiped out. While some people debate whether or not a mass extinction is occurring, the Earth is definitely declining in biodiversity each year. The loss of 1 million species within 150 years is considered a mass extinction. (a) Some scientists estimate that there is a 0.5% loss of species every year due to habitat loss. If there are 5 million species on the earth, how many species are going extinct each year? Does our current situation count as a mass extinction? Show your work. (2 points) (b) what if the loss of species is 0.25%, how many species are going extinct each year? Does this situation count as a mass extinction? Show your work. (2 points) Decay of todine 131 2. Radioactive decay is an important topic in Environmental Science because of the concern over nuclear waste. (a) What are TWO anthropogenic sources of (b) One radioactive element that has a variety of radioactive waste? (2 points) uses of lodine-131. Using the graph, what is the half- life of lodine 131? (1 point) neutrons does this isotope of iodine have? (1 point) leave only 0.5 g. What is the half-life of Argon-35? (2 points) (c) lodine has an atomic number of 53. How many (d) In 6 seconds, 4 g of Argon-35 will decay to 32BB

Explanation / Answer

Question no 40

Answer is option D. 5%.

The energy conversion efficiency of converting electricity to light energy in an incandescent light bulb is 5 %.

The energy conversion efficiency may be described as the ration between the useful output (Like light, electrical power) of an energy conversion machine and the input.

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