Normal 0false false falseEN-US X-NONE X-NONE/* Style Definitions */table.MsoNormalTable{mso-style-name:Table Normal;mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-parent:;mso-padding-alt:0in 5.4pt 0in 5.4pt;mso-para-margin-top:0in;mso-para-margin-right:0in;mso-para-margin-bottom:10.0pt;mso-para-margin-left:0in;line-height:115%;mso-pagination:widow-orphan;font-size:11.0pt;font-family:Calibri,sans-serif;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Times New Roman;mso-bidi-theme-font:minor-bidi;}The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life 30 minutes decreases to 5 sec-1 after 2 hours. The initial count rate was(a) 20 sec-1(b) 25 sec-1(c)80 sec-1(d) 625 sec-1
Navjyot Kalra , 11 Years ago
Grade 10
1 Answers
Navjyot Kalra
Last Activity: 11 Years ago
(c)
Half-life = 30minutes; Rate of decrease (N) = 5 per second and total time = 2 hours = 120 minutes.
Relation for initial and final count rate
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