Start Free Mock LoginAlready registered? Login here

Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsRadioactivityMedium2 minQB

PhysicsMediumsingle choice

A radioactive element is disintegrating having half like 6.92 sec. The fractional change in number of nuclei of the radioactive element during 10 sec is :

Options:

Answer:

Solution:

$λ = \frac{ln 2}{T _{1/2}} = \frac{0.693}{6.92 s} = 0.1 s^{- 1}$

Fraction decayed in 10 s:

$1 - e^{- λ t} = 1 - e^{- 1} = 0.632 \approx 0.63$

Hence option (B).

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Radioactivity

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...