Half-Life

**Half-Life**

This program might prove useful to chemistry or physics teachers or students.

[[code format="lb"]]
'Halflife 2.0
'by Scott Ausbrooks
'May 2012

'This program calculates the amount of radioactive
'material remaining after "x" number of halflives

nomainwin
 WindowWidth = 900
 WindowHeight = 500

 button #1.button1,"Calculate",[action], UL, 10,30,120,50
 button #1.button2,"Clear",[clear], LL, 10,20,120,50
 button #1.button3,"Exit",[quit],LR,120,60,120,50
 textbox #1.textbox0, 650, 30, 180, 60'mass
 textbox #1.textbox1, 650, 130, 180, 60 'halflife
 textbox #1.textbox2, 650, 230, 180, 60'decaytime
 textbox #1.textbox3, 310, 320, 180, 100'result
 statictext #1.originalmass, "Original Mass",550,30,100,50
 statictext #1.decaytime, "Decay Time",550,230,100,50
 statictext #1.halflife, "Half-Life",550,150,100,25
 statictext #1.result, "Result",365,430,100,25
open "Radioactive Isotope Remaining" for window as #1
 print #1, "font times_new_roman 18 BOLD"
 print #1.textbox0, "!setfocus"
 print #1, "trapclose [quit]"
wait
[action]
 print #1.textbox1,"!contents?"
 input #1.textbox1, halflife$

 print #1.textbox2,"!contents?"
 input #1.textbox2, decaytime$

 print #1.textbox0,"!contents?"
 input #1.textbox0, mass$

 numhalflife = val(decaytime$)/val(halflife$)
 newmass = val(mass$) * (.5^numhalflife)
 print #1.textbox3, "!font times_new_roman 18 bold"
 print #1.textbox3, newmass
 wait
[clear]

 print #1.textbox0, ""
 print #1.textbox1, ""
 print #1.textbox2, ""
 print #1.textbox3, ""

 print #1.textbox0, "!setfocus"
wait

[quit]
 confirm "Really quit?";answer$
 if answer$ = "no" then wait
 close #1:end

[[code]]