Assertion: A neutron impinging on U 235, splits it to produce Barium and Krypton. From 16 analysed samples, we registered eight violations because of too high activities of radiostrontium. Natural radioactivity of water is derived primarily from the radioactive rocks and minerals sitting below the waters surface. … Reason Explained. nucleoid is correct for If radioactive deoxythymidine triphosphate (dTTP) is added to a culture of rapidly growing bacterial cells, where in the cell would you expect to find the greatest concentration of radioactivity? So when she died, she had to be buried in a lead casket. Trace amounts of radioactive elements may also reside in seafood, meat, eggs, milk, and plant-based foods. In both cases the radioactive Concept Notes & Videos 233. Radioactivity is the nuclear phenomenon, i.e., radioactive radiation are emitted from the nucleus of the radioactive substance, so any physical change like oxidation or any chemical change does not affect its nature of radioactivity. CISCE ICSE Class 10. These products are imported in big charges of tons from East European countries, such as Ukraine, Poland, Russia or Hungary. A Radioactive Substance is Oxidized. Reason: U – 235 is a fissile material. Harmful effect: The radiations kills living cells and tissues. As you say, the daughter nucleus may be less stable, therefore the reason for radioactivity cannot be to gain stability. This is done by an atomic nucleus that, for some reason, is unstable; it "wants" to give up some energy in order to shift to a more stable configuration. As its name implies, radioactivity is the act of emitting radiation spontaneously. Important Solutions 2864. Question 1. i)Use of radioactivity: Radiations from cobalt 60 are used to treat cancer. Radioactivity 1. $\begingroup$ I'm not saying that there is radioactivity in general : I'm looking for the reason of radioactivity in a river in the case where the nuclear plant is the reason : what is the exact reason : contamination from primary circuit to the tertiary circuit, waste sent to river, etc. Using Selina Class 10 solutions Radioactivity exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. Liquid scintillators4. Since she and her husband Pierre were still trying to understand radioactivity, they didn't take the same precautions used today. Question Bank Solutions 25949. Radioactivity ... Detecting RadiationRadioactive particles are far too small to be detected by our senses; it is for this reason that scientists have created a variety of ways to detect the alpha, beta, and gamma decays of nuclei.1. All the solutions of Radioactivity - Physics explained in detail by experts to help students prepare for their ICSE exams. All tissues examined showed incorporation of radioactivity from (99m)Tc-HA starting at 15 min and persisting for 48 h, in a pattern significantly different from (99m)Tc-P. Whole-body scintigraphs and close-ups of the ventral chest region showed nonalimentary radioactivity from (99m)Tc-HA concentrated in joints, vertebrae and salivary glands four hours after administration. A) If both assertion and reason are true and the reason is the correct explanation of the assertion. ii)Background radiations are produced by substances like K-40, C-14 and radium contained in our body. Pitchblende is a mineral that is the crystallized form of uranium oxide, and is about 70 percent uranium. Radioactive elements can be used to kill overactive cells like cancer cells. If radioactive elements are in your water, it stands to reason that they may exist in your food as well. She defined radioactivity at the time to be this activity of rays to be dependent on uranium's atomic structure, the number of atoms of uranium. For a completely stable state that transition takes an infinite amount of time. The mathematician was interested in physics, and he could read German. The aim of this research was to determine the activity of 210 Po and natural gamma emitters as 40 K, 214 Pb, 214 Bi, 228 Ac, 212 Pb and 212 Bi in 18 brands of coffee powder and in coffee. Stable and Unstable Nuclei | Radioactivity | Physics | FuseSchoolHow do you know if an atom is stable? (8) (a) If both the assertion and the reason are true and the reason is the correct explanation of the assertion. 1934 and the discovery of artificial radioisotopes Most of radioactive nuclei have vanished from earth, but some have been recreated by man. 40 K showed a mean activity of 907.4 ± 115.6 Bq kg −1. During the following years, a new phenomenon was discovered: radioactivity. The water adapts their traits when it comes in contact with them. Reason : Heavy elements exhibit radioactivity. Concise Physics Part II - Selina Solutions for Class 10 Physics ICSE, 12 Radioactivity. Radon activity concentration can vary from one to more orders of magnitude over time and space. We Provide Step by Step Answer of Exercise-12(A), MCQs-12(A), Exercise-12(B), MCQ-12(B) and Numericals -12(B) Questions of Exercise-12 Radioactivity ICSE Class-10 Concise .Visit official Website CISCE for detail information about ICSE Board Class-10. Instability simply means that there exists an allowed transition to a lower energy state. Radioactivity is a susceptible technique and gives accurate results within a short time frame compared to non-radioactive alternatives. Syllabus. Selina Solutions Concise Physics Class 10 Chapter 12 Radioactivity consists of topics such as the structure of the atom and nucleus, atomic model, isotopes, isobars, isotones, Radioactivity, Radioactivity as an emission of alpha, beta and gamma radiations, properties of alpha particles, properties of beta particles and properties of gamma particles. Banana equivalent dose (BED) is an informal measurement of ionizing radiation exposure, intended as a general educational example to compare a dose of radioactivity to the dose one is exposed to by eating one average-sized banana.Bananas contain naturally occurring radioactive isotopes, particularly potassium-40 (40 K), one of several naturally-occurring isotopes of potassium. For this reason cancer radiotherapy is still a valuable tool in medicine. In certain areas more than others, radioactive gases emitted from molten magmas have seeped into the natural bodies of water creating larger traces of radioactivity magnitude. And the radiation discovered in 1895 by Röntgen was particularly mysterious, and for that reason was called X-rays by its discoverer. Time Tables 15. Please find below all the Coiner of radioactivity crossword clue answers and solutions for the Newsday Crossword April 16 2021 Answers. After all, plants absorb water and are exposed to the same environment as you. To illustrate the extreme sensitivity of radioactivity measurements, let's take the example of the analysis carried out at the CENBG laboratory in Bordeaux of a bottle of Grand Cru which turned out to be a fake. The reason is that strawberries are cultivated in greenhouses, in the shelter. Natural and artificial radioactivity has been measured in foodstuffs but there are very few data for this beverage. Historically the beneficial effects were discovered first, partly because the long-term effects were only discovered when it was too late. Primordially they become radioactive as a result of supernovae conflagrations where the explosive by products of heavy elements are created - some with excess neutrons in their nuclei. What Changes Would You Expect to Take Place in the Nature of Radioactivity? Maximum students of CISCE Class 10 prefer Selina Textbook Solutions to score more in exam. The seeds of the discovery were sown by the person of Henri Poincaré and the subject of X rays. Radioactive waste generates radioactivity and emits radioactive byproducts. Textbook Solutions 25526. For this reason, references to radon in this document refer only to radon-222. The reason is that almost all unstable nuclei, by definition, have decayed and vanished over time. What Changes Would You Expect to Take Place in the Nature of Radioactivity? Semiconductor detector 39. Marie and Pierre spent time working with pitchblende. Marie Curie was a brilliant scientist who helped expand our knowledge of radioactivity. Radioactive sources can be very useful but need handling carefully to ensure safety. Radioactivity in Agriculture This is mainly a phenomenon of technologically enhanced radioactivity due to the need of fertilizers in agriculture. The radioactivity levels are comparable to other marine areas in the world. ... For this reason, radiological safety is becoming a prime concern in the region. Scintillation counter3. He had … Radioactivity is the physical phenomenon of certain elements - such as uranium - of emitting energy in the form of radiation.This energy comes from the decay of an unstable nucleus. It helps the atom gain a relatively stabler configuration. Geiger counter2. Explain Your Answer. Only in 2009 was our focus set on blueberries and other wild-grown berries. I search for the exact reason in the case where the nuclear plant is the "global reason". Fertilizers are made industrially from mining products or are based on biological materials used for fertilizing purposes. Assertion and reason type questions. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Uses and dangers of radioactivity People are exposed to sources of radiation in all aspects of everyday life. This spontaneous loss, known as radioactive decay, continues till a stable (nonradioactive) configuration is achieved. In case something is wrong or missing kindly let me know and I will be more than happy to help you out with the right solution for each of the Newsday crossword puzzle clues. (Also used in 1789 in the discovery of uranium). In … For a very unstable state that transition typically takes a short amount of time. Radioactivity ICSE Class-10 Concise Physics Selina Solutions Chapter-12. Radioactivity is the spontaneous loss of energy from an unstable atom, in the form of various nuclear byproducts (radiation). Question Papers 301. Radioactivity has beneficial and negative effects on our health. 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