AIEEE test.

guys doubt.

Q.68
N_remaining = N₀ e^-λt no ????

you've gievn Nremaining = N₀ ( 1 - e^-λt)

Q.69 e- goes from collector to base no ?
and NPN mein well . N region se P region electron jayega na ? and one Q . Mughe pata nahin , does the configuration of the amp have an effect. amp matlab CE mode me hi kya or CC CB mode bhi ho sakta hai.?

and Q.77, what's the exact Q ?

is it 1.dx / (√(1-x)/(1+x) or 1dx / √(1-x) / (1+x)

thanks