C) but smaller than one D) can have any value. E) can only be zero or one F) is
ID: 2303903 • Letter: C
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C) but smaller than one D) can have any value. E) can only be zero or one F) is always an even number 38. The decay probability of radioactive nuclei A) is influenced by an external high-frequency magnetic field B) is influenced by external pressure. C) is influenced by temperature. D) is influenced by the oxygen content of the medium. E) is not nfluenced at all by external physical conditions. 39. The number of decayed nuclei per unit time in a radioactive sample depends on A) the temperature. B) the external pressure. C) the number of radioactive nuclei in the sample. D) the external magnetic field. E) the external electric field. 40. What is the relationship between the rate constant of the radioactive decay and half-life (time)? A) Greater rate constant corresponds to longer half-life B) Greater rate constant corresponds to shorter half-life. C) They are not related to each other 41. What is the relationship of half-life and average lifetime of a radioactive nuclei? A) No relation (they are independent of each other) B) They are linearly proportional to each other C) They are inversely proportional to each other D) They depend on each other according to another function. 42. The half-life of a radioactive material A) is the same as the average lifetime of the radioactive nuclei. B) is always longer than the average lifetime of the radioactive nuclei. C) is always shorter than the average lifetime of the radioactive nuclei D) can be both longer or shorter than the average lifetime of the radioactive nuclei. 43. If the half-life of a radioactive material is 1 day, in what time will the number of radioactive nuclei become zero? A) 0,5 day B) 1 day C) 2 days. D) 4 days. E) infinite time. 44. After 9 (nine) half-lives the number or radioactive nuclei decays to A) the 64th. B) the 256th. C) the 512th D) the 1024th. E) the 2048th of the initial number 45. Alpha-radiation is composed of A) electrons B) positrons. C) helium nuclei. 1:05 AMExplanation / Answer
(38) Option C is correct as radioactive is influenced by the temperature
(39) option C is correct decay of number of nuclei depends upon the number of nuclei in the sample.
(40)option B is correct,the faster reaction will have a shorter half-life
(41) Option bB is correct as they are linearly proportional to each other
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