HOMEWORK EXAM 3: Chapter 19: The half life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175 years later? Answer 0.166 0.125 0.062 here 0.015 Which relation is not correct? Answer 11p = 11H = proton 0-1e = 0-1β = electron here +10e = +10β= positron 10n = neutron As a result of beta decay‚ the product nucleus is Answer one atomic number lower than the original element. two atomic number
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The endocrine system works with the nervous system to maintain homeostasis. The endocrine system secretes hormones in the human body‚ which are produced in endocrine glands and are released into the bloodstream to travel to the its specific target cell‚ tissue‚ or organ. Exocrine glands produce chemicals that are discharged into the surroundings. Hormones can either produce short-lived responses or long-term responses. An example of a short-lived response is when adrenaline (epinephrine)causes the
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graphite is negligible at ambient conditions. Other specialized applications also exist or are being developed‚ including use as semiconductors: some blue diamonds are natural semiconductors‚ in contrast to most diamonds‚ which are excellent electrical insulators. The conductivity and blue color originate from boron impurity. Boron substitutes for carbon atoms in the diamond lattice‚ donating a hole into the valence band. Substantial conductivity is commonly observed in nominally undoped diamond grown by
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Portfolio file Done by Thomas Liebenberg‚ Muziwandile Nkosi and Maxim Zubov. Page No. Content 3. Dedication. 4. Introduction and type of project. 5. Question. 6. Hypothesis. 7. Apparatus‚ equipment‚ material and technology used. 8. Fair testing- control and variables. 9. Method. 10. Observation/diagrams/photographs. 11. tables 12. Graphs. 13. Conclusion. 14. Problems encountered and solutions found. 15. How does our project benefit mankind? 16. Bibliography. 17. Acknowledgements. 18. Plagiarism
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1. On simplifying 999813 × 999815 + 1 (999814)2 4. ‚ we get _______. 2. (a) 1 (b) 2 (c) 3 (d) 4 2n+4 2(2n ) 2(2 n+3 n+1 (a) 2 ) = __________. 5. 1 8 – n (c) 1 – 2 3. If x+ 1 =a+b x (b) –2 (d) n+1 7 8 and x 1 =a x then (a) ab = 1 (b) a = b (c) ab = 2 (d) a + b = 0 b‚ 6. The average of eleven-members cricket team reduces by 2 when two players of ages 30 and 32 leave the team and two new players of equal age join it. The age of each of the newcomers is _______. (a)
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CHAPTER 1 1.1 Introduction: After going through tedious working days isn’t it a wonderful thing if people can just relax on the sofa and control the temperature in the living room‚ just with single button the room temperature can be controlled automatically so when the room temperature is too cold the heater will operate to produce a regulated temperature and when the room temperature is too high the cooling system will operate to produce the desired temperature. 1.2 Objectives: There are
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Math’s Portion: Two dice are thrown. What is the probability that the sum of dots shown is 4 or 6? d) 5/18 1/4 1/6 2/9 A poll is 20 m apart from a man. The man is making an angle of elevation of 45 degree with the pole head. What is the height of poll? 15m 25m 20m 17.707m 3) If -2‚ 4‚ 10 are in A.P then which term of the A.P is 148? 25 26 32 33 If f(x+1/x) = x- 1/x then f(x) =? 5) If a cylindrical bar has a radius 2 m and height 9 cm and if it is melted and become a sphere
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Page 12 1 a) Between t = 30 and t = 45 mins b) 7.5 mins c) i) distance travelled = area under graph between t = 0 and t = 12½ mins ii) average speed = total distance travelled total time for journey = total area under graph 60 mins 2 a) ∆v = 32 m/s a =10 m/s² t = ∆v = 32 = 3.2 s a 10 b) 3 a) OP – constant acceleration PQ – constant acceleration (greater than OP) QR – constant speed RS – constant deceleration b) O and S c) 6 m/s d) 70 s e) Total distance travelled = area under
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Natural gas in Bangladesh From Wikipedia‚ the free encyclopedia This article has multiple issues. Please help improve it or discuss these issues on the talk page. This article includes a list of references‚ related reading or external links‚ but its sources remain unclear because it lacks inline citations. (April 2012) This article is written like a personal reflection or essay rather than an encyclopedic description of the subject. (April 2012) This article may need to be wikified to meet
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Pg 2 Pg 2 We as a team will be investigating the effects global warming is having on the Antarctic landscape‚ we will also look at the effects that the change in the Antarctic landscape is having on other factors such as the dispersion of animals. To look at the change we will look at the rate of contraction of the land‚ the rate of ice break up‚ the rate of which a lake is created‚ the flow rate of Moulins‚ the rate of sea level increase. As well as this we will try to determine how the reduction
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