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

Explain the lenz law, Explain the Lenz Law An induced current always fl...

Explain the Lenz Law An induced current always flows in a direction so that its electromagnetic field opposes the change in magnetic flux producing it. This is embodied in the

Michelson interferometer., why michelson interferometer is called interferr...

why michelson interferometer is called interferrometer

Detection (receiver), Detection (Receiver): The antenna receiver these mod...

Detection (Receiver): The antenna receiver these modulated waves from different transmitting stations. Channel selector selects the desired signals. The selected signals are am

Thermoelectric power:, The rate of modification of thermo emf with the chan...

The rate of modification of thermo emf with the change in the temperature of the hot junction is known as thermoelectric power.

Ray of light in air and flat piece of glass, A ray of light in air is occur...

A ray of light in air is occurrence upon a flat piece of glass. How acts the path that the light travels along when it is in the glass compare with the path in the air?

Temperature, If the temperature in a room is 84 degrees at the floor what w...

If the temperature in a room is 84 degrees at the floor what will it be at a 30 foot ceiling

Which way does the lower pedal move relative to the ground, A bicycle is su...

A bicycle is supported so that it is stopped from falling sideways but can move forwards or backwards; its pedals are in their highest and lowest positions. A student crouches

Explain joule''s law, Explain Joule's Law: "Work done is directly propo...

Explain Joule's Law: "Work done is directly proportional to the heat produced.

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