Question Number 41361 by Necxx last updated on 06/Aug/18 $${The}\:{half}\:{life}\:{of}\:{radium}-\mathrm{226}\:{is}\:\mathrm{1620} \\ $$$${years}.{Calculate}\:\left({a}\right){the}\:{decay}\:{constant} \\ $$$$\left({b}\right){the}\:{time}\:{it}\:{takes}\:\mathrm{60\%}\:{of}\:{a}\:{given} \\ $$$${sample}\:{to}\:{decay},\:{and}\:\left({c}\right){the}\:{initial} \\ $$$${activity}\:{of}\:\mathrm{1}{gm}\:{of}\:{pure}\:{radium}-\mathrm{226} \\ $$ Answered by MJS last updated…
Question Number 41148 by Necxx last updated on 02/Aug/18 $${Calculate}\:{the}\:{speed}\:{of}\:{an}\:{electron} \\ $$$${whose}\:{kinetic}\:{energy}\:{is}\:{equal}\:{to} \\ $$$$\mathrm{2\%}\:{of}\:{its}\:{rest}\:{mass}. \\ $$ Answered by tanmay.chaudhury50@gmail.com last updated on 03/Aug/18 $$\frac{\mathrm{1}}{\mathrm{2}}{mv}^{\mathrm{2}} =\frac{\mathrm{2}}{\mathrm{100}}{m}_{\mathrm{0}}…
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Question Number 168164 by nadovic last updated on 05/Apr/22 $$\mathrm{Find}\:\mathrm{the}\:\mathrm{total}\:\mathrm{energy}\:\left({in}\:{Joules}\right) \\ $$$$\mathrm{of}\:\mathrm{a}\:\mathrm{particle}\:\mathrm{of}\:\mathrm{mass}\:\mathrm{4}.\mathrm{0}×\mathrm{10}^{−\mathrm{11}} \mathrm{kg} \\ $$$$\mathrm{moving}\:\mathrm{at}\:\mathrm{80\%}\:\mathrm{the}\:\mathrm{speed}\:\mathrm{of}\:\mathrm{light}. \\ $$ Commented by JDamian last updated on 05/Apr/22 https://youtu.be/eOCKNH0zaho…
Question Number 34170 by Rio Mike last updated on 01/May/18 $${the}\:{distance}\:{from}\:{A}\:{to}\:{B}\:{is}\:\mathrm{44}{km} \\ $$$${the}\:{speed}\:{of}\:{a}\:{car}\:{is}\:\mathrm{2}{kms}^{−\mathrm{1}} \:{find}\: \\ $$$${the}\:{term}\:{hence}\:{the}\:{amount}\:{of}\: \\ $$$${money}\:{needed}\:{to}\:{buy}\:{fuel}\:{if}\:{for}\: \\ $$$${every}\:\mathrm{6}{km}\:\mathrm{10}\:{l}\:{of}\:{fuel}\:{is}\:{used}\:{which} \\ $$$${causes}\:\mathrm{600}\:{box}. \\ $$ Answered…
Question Number 163988 by mathls last updated on 12/Jan/22 $${if}\:{here}\:{are}\:\mathrm{20}\:{apple}\:{in}\:{a}\:{box},\:{how}\:{many}\: \\ $$$${are}\:{the}\:{significant}\:{figures}\:{in}\:{it}? \\ $$ Commented by mathls last updated on 13/Jan/22 $${help}! \\ $$ Terms…
Question Number 163858 by mathls last updated on 11/Jan/22 $${which}\:{object}\:{or}\:{substance}\:{has}\:\:{the}\: \\ $$$$\mathrm{2}{rd}\:{number}\:{velocity}\:{after}\:{light}? \\ $$ Commented by mathls last updated on 11/Jan/22 $${please}? \\ $$ Commented…
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Question Number 158694 by ilhamdiii last updated on 07/Nov/21 $${Help}\:{me}\:{sir} \\ $$$$\: \\ $$$${in}\:{phase}\:{sppace}\:\:{d}^{\mathrm{3}} {p}={dp}_{{x}} {dp}_{{y}\:} {dp}_{{z}} \:\:{then} \\ $$$${find} \\ $$$$\:\int_{\mathrm{0}} ^{\infty} \:{P}^{\mathrm{2}\:} {e}^{\frac{{p}^{\mathrm{2}}…
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