Home
Class 11
PHYSICS
Two identical samples (same material and...

Two identical samples (same material and same amount) P and Q of a radioactive substance having mean life T are observed to have activities `R_(p) andR_(Q)` respectively, at the time of observation. If P is older than Q, Then the difference in their age is

A

`Tln((A_(p))/(A_(Q)))`

B

`Tln((A_(Q))/(A_(P)))`

C

`1/Tln((A_(P))/(A_(Q)))`

D

`T((A_(P))/(A_(Q)))`

Text Solution

Verified by Experts

The correct Answer is:
B
`A_(P)=A_(Q) e^(-gamma t)=A_(0)e^(1/Tt) " " :. t=Tln(A_(Q))/(A_(P))`
Promotional Banner

Topper's Solved these Questions

  • FULL TEST 2

    RESONANCE ENGLISH|Exercise Exercise|30 Videos

  • GEOMETRICAL OPTICS

    RESONANCE ENGLISH|Exercise Exercise|63 Videos

Similar Questions

Explore conceptually related problems

Two identical samples (same material and same amout) P and Q of a radioactive substance having mean life T are observed to have activities A_P and A_Q respectively at the time of observation. If P is older than Q, then the difference in their age is

Two identical samples (same material and same amout) P and Q of a radioactive substance having mean life T are observed to have activities A_P and A_Q respectively at the time of observation. If P is older than Q , then the difference in their age is

Two particles p and q located at distances r_p and r_q respectively from the centre of a rotating disc such that r_p gt r_q .

Two radioactive samples of different elements (half-lives t_1 and t_2 respectively) have same number of nuclei at t=0 . The time after which their activities are same is

From a light-house L two ships P and Q are observed in direction south-west and 15^(@) east of south respectively. At the same time Q is observed from point P in south-east direction. If LP=4 km , the distance between the ships is

For a radioactive material, its activity A and rate of change of its activity of R are defined as A=(-dN)/(dt) and R=(-dA)/(dt) , where N(t) is the number of nuclei at time t . Two radioactive source P (mean life tau ) and Q (mean life 2 tau ) have the same activity at t=0 . Their rates of activities at t=2 tau are R_(p) and R_(Q) , respectively. If (R_(P))/(R_(Q))=(n)/(e ) , then the value of n is:

P and Q have co-ordinates (-2, 3) and (5, 4) respectively. Reflect P in the x-axis to P' and Q in the y-axis to Q'. State the co-ordinates of P' and 'Q .

Suppose P and Q are two different matrices of order 3xx n " and" n xx p , then the order of the matrix P xx Q is ?

Two metal wires P and Q of same length and material are stretched by same load. Yheir masses are in the ratio m_(1):m_(2) . The ratio of elongation of wire P to that of Q is

Two thick wires and tow thin wires, all of same material and same length from a squre in the three different ways P, Q and R as shown. The current flowing through the arrangement is i. Let B_(P), B_(Q) and B_(R) represent the magnetic field at the centre of square in the three cases, then

RESONANCE ENGLISH-FULL TEST 3-Exercise
  1. A ball is suspended from the top of a cart by a light string of length...

    Text Solution

    |

  2. When an explosive shell travelling in a parabolic path under the effec...

    Text Solution

    |

  3. A space 2.5cm wide between two large plane surfaces is filled with oil...

    Text Solution

    |

  4. Two identical samples (same material and same amount) P and Q of a rad...

    Text Solution

    |

  5. Two walls of thickness d(1) and d(2) and thermal conductivites K(1) an...

    Text Solution

    |

  6. Three coaxial circular wire loops and a stationary observer are positi...

    Text Solution

    |

  7. The frequency of oscillation of current in the inductor is -

    Text Solution

    |

  8. In the circuit diagram shown

    Text Solution

    |

  9. Find the effective value of current. i=2 sin 100 (pi)t + 2 cos (100 ...

    Text Solution

    |

  10. The electric intesity E, current density j and conductivity sigma are ...

    Text Solution

    |

  11. In the given electrical circuit, the potential difference between poin...

    Text Solution

    |

  12. Which of the following is (are) correct? .

    Text Solution

    |

  13. A point source of light is used in a photoelectric effect. If the sour...

    Text Solution

    |

  14. The distance of n^(th) bright fringe to the (n+1)^(th) dark fringe in ...

    Text Solution

    |

  15. The escape velocity of a sphere of mass m is given by (G= univesal gra...

    Text Solution

    |

  16. A uniform electric field in positive x-direction on exists in space. A...

    Text Solution

    |

  17. An electron is revolving around a proton. The total work done in one r...

    Text Solution

    |

  18. Four charges are rigidly fixed along the Y-axis as shown. A positive c...

    Text Solution

    |

  19. Assertion: Capacity of a parallel plate capacitor increases when dista...

    Text Solution

    |

  20. The direction of the field B at P is the V shaped wire is in x-y ...

    Text Solution

    |