radioactive substance, Physics

Assignment Help:

A certain radioactive substance has a half-life of 40 minutes. How much of an original 100 grams substance will remain after 2 hours?

solution) m= m0/2t/T

m=100 gms..

t=2 hours=2*60=120 min..

T=40 min

m=100/2120/40

m=100/23

m=100/8

m=12.5 gms.


Related Discussions:- radioactive substance

Will light go any length along the fiber, Will light go any length along th...

Will light go any length along the fiber? Each conductor has losses, and in the case of fiber optics, all these are sizeable. Light losses into the industry average 2 to 5 perc

Write the maxwells electromagnetic equation, Write the Maxwell's electromag...

Write the Maxwell's electromagnetic equation, which follows from the non-existence of isolated magnetic pole

Define electric potential, Define: Electric potential. The electric po...

Define: Electric potential. The electric potential in an electric field at a point is define as the amount of work done in moving a unit positive charge from infinity to that

Magnetic field and electric current., the magnetic field at a dictance of 2...

the magnetic field at a dictance of 2cm from the axis of a straight conductor carrying current is 12mT.Find the currentin the conductor?

Determine the combined stress distribution, A universal column of 6m carrie...

A universal column of 6m carries a Point Load of (180+n2) kN centrally at its axis. The column also carries one end of a simply supported beam of 5m with a uniformly distributed lo

Write any four characteristics of electromagnetic waves, Write any four cha...

Write any four characteristics of electromagnetic waves. Give two uses each of 1. Radio-waves 2. Micro-waves.

Explain working of common-emitter amplifier, State whether the following s...

State whether the following statements are true or false: (a) The purpose of a transistor amplifier is to enhance  the frequency of the input signal. (b) The gain of an ampl

Electrons in silicon, At 200.0 K, silicon has 3.79 x 10 -18 free electrons...

At 200.0 K, silicon has 3.79 x 10 -18 free electrons per atom. How many free electrons/cm 3 are there in silicon at this temperature?

Explain the types of equilibrium, STABLE EQUILIBRIUM If object is in st...

STABLE EQUILIBRIUM If object is in stable equilibrium and if we displace object to a very little displacement dr then it will return back to starting position. UNSTABLE EQU

A simple model of the earth and moon, A simple model of the earth and moon ...

A simple model of the earth and moon The earth can be shown by an orange or other round object stuck on a piece of bamboo or a meat skewer. A piece of bent wire or knitting nee

3/11/2013 3:37:25 AM

half life = 40minutes =2/3 hours

t(1/2)=(ln2 /k)

then k=(ln2/t(1/2)) = ln2/(2/3) = 3/2*(ln2)

origianl substance y0= 1000 grams

y=y0e-kt

y= 1000*(e-(3/2(ln2))*2 ) = 1000/8 = 125 grams

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd