Half-life of a radioactive substance is ...

Half-life of a radioactive substance is 20 minute. The time between 20% and 80% decay will be

20 min

30 min

40 min

25 min

Text Solution

Verified by Experts

Topper's Solved these Questions

QUESTION PAPER 2009
WB JEE PREVIOUS YEAR PAPER|Exercise Multiple Choice Questions (Physics)|40 Videos
QUESTION PAPER 2011
WB JEE PREVIOUS YEAR PAPER|Exercise PHYSICS|39 Videos

Similar Questions

Explore conceptually related problems

The half-life of a radioactive substance is 20 min. The approximate time interval (t_2-t_1) between the time t_2 when 2/3 rd of its has decayed and time t_1 when 1/3 rd of it had decayed is - (A) 14 min (B) 20 min (C) 28 min (D) 7 min

What do you mean by half-life of a radioactive substance ?

The half-life of a radioactive substance is 1 y. After 2 y, what will the amount of the substance that will be disintegrated?

The half-life of a radioactive element is 1600 y. After what time 10% of that element present in any radioactive sample will disintegrate?

The number of atoms of a radioactive substance of half-life T is N_(0) at t= 0. The time necessary to decay from N_(0)//2 atoms to N_(0)//10 atoms will be

The half -life of a radioactive nucleus is 50 days. What is the time interval (t_2-t_1) between the time t_2 when 2/3 of it has decayed and the time t_1 when 1/3 of it had decayed ?

What is mean life of radioactive substance ? Show its relation with half-life .

Half of a substance is consumed in 40 minutes. When the quantity of the substance is decreased to half, the half-life of the change is 20 minute. The order of the reaction is:

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes, respectively. Initially, the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be - (A) 1 : 16 (B) 4 : 1 (C) 1 : 4 (D) 5 : 4

A radioactive substance is subject to the law of natural decay (dv)/(dt)=-kv , where v is the volume of the substance at time t and k is a positive constant. The half-life of the substance is the time it takes for half the substance to disappear. Calcualte the half-life if 20 % of the substance disappeared in 15 years.

WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2010-PHYSICS

The decimal equivalent of the binary number (11010.101)(2) is
Text Solution
|
In a common emitter configuration, a transistor has beta=50 and input...
Text Solution
|
Half-life of a radioactive substance is 20 minute. The time between 20...
Text Solution
|
The energy released by the fission of one uranium atom is 200 MeV. The...
Text Solution
|
A body is projected with a speed u m/s at an angle beta with the hori...
Text Solution
|
A ball is projected horizontally with a velocity of 5 m/s from the top...
Text Solution
|
A stone falls freely from rest and the total distance covered by it in...
Text Solution
|
Two blocks of 2 kg and 1kg are in contact on a frictionless table. If ...
Text Solution
|
If momentum is increased by 20%, then kinetic energy increases by
Text Solution
|
A boy of mass 40 kg is climbing a vertical pole at a constant speed. I...
Text Solution
|
The value of lamda for which the two vectors hata = 5hati+lamdahatj+...
Text Solution
|
If veca+vecb = vecc and a+b=c then the angle included between veca an...
Text Solution
|
The height vertically above the earth's surface at which the accelerat...
Text Solution
|
The change in the gravitational potential energy when a body of mass m...
Text Solution
|
A particle of mass m is attached to three identical massless springs o...
Text Solution
|
A spring of force constant k is cut into three equal parts. The force ...
Text Solution
|
A body floats in water with 40% of its volume outside water. When the ...
Text Solution
|
A uniform long tube is bent into a circle of radius R and it lies in a...
Text Solution
|
Two solid spheres of same metal but of mass M and 8 M fall simultaneou...
Text Solution
|
A particle is executing linear simple harmonic motion of amplitude A. ...
Text Solution
|