हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान कक्षा ११

Lithium (Z = 3) Has Two Stable Isotopes 6li and 7li. When Neutrons Are Bombarded on Lithium Sample, Electrons and α-particles Are Ejected. Write Down the Nuclear Process Taking Place. - Physics

Advertisements
Advertisements

प्रश्न

Lithium (Z = 3) has two stable isotopes 6Li and 7Li. When neutrons are bombarded on lithium sample, electrons and α-particles are ejected. Write down the nuclear process taking place.

योग

उत्तर

The nuclear process taking place is shown below.

`""_8^6"L_i" + n → ""_3^7L_i`

`""_3^7L_i + n → ""_3^8L_i → ""_4^8"Be" + barv + e^-`

`""_4^8"Be" → ""_2^4"He" + ""_2^4"He"`

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 24: The Nucleus - Exercises [पृष्ठ ४४२]

APPEARS IN

एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
अध्याय 24 The Nucleus
Exercises | Q 15 | पृष्ठ ४४२

संबंधित प्रश्न

 

(a) Write the basic nuclear process involved in the emission of β+ in a symbolic form, by a radioactive nucleus.

(b) In the reactions given below:

(i)`""_16^11C->_y^zB+x+v`

(ii)`""_6^12C+_6^12C->_a^20 Ne + _b^c He`

Find the values of x, y, and z and a, b and c.

 

State the law of radioactive decay.


How is the mean life of a given radioactive nucleus related to the decay constant?


Write symbolically the process expressing the β+ decay of `""_11^22Na`. Also write the basic nuclear process underlying this decay.


The half-life of `""_38^90 "Sr"` is 28 years. What is the disintegration rate of 15 mg of this isotope?


Under certain circumstances, a nucleus can decay by emitting a particle more massive than an α-particle. Consider the following decay processes:

\[\ce{^223_88Ra -> ^209_82Pb + ^14_6C}\]

\[\ce{^223_88 Ra -> ^219_86 Rn + ^4_2He}\]

Calculate the Q-values for these decays and determine that both are energetically allowed.


A radioactive nucleus 'A' undergoes a series of decays as given below:

The mass number and atomic number of A2 are 176 and 71 respectively. Determine the mass and atomic numbers of A4 and A.


Define 'activity' of a radioactive substance ?


In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following particles is emitted in the decay?


The decay constant of a radioactive sample is λ. The half-life and the average-life of the sample are respectively


The decay constant of `""_80^197`Hg (electron capture to `""_79^197`Au) is 1.8 × 10−4 S−1. (a) What is the half-life? (b) What is the average-life? (c) How much time will it take to convert 25% of this isotope of mercury into gold?


The decay constant of 238U is 4.9 × 10−18 S−1. (a) What is the average-life of 238U? (b) What is the half-life of 238U? (c) By what factor does the activity of a 238U sample decrease in 9 × 109 years?


Consider the situation of the previous problem. Suppose the production of the radioactive isotope starts at t = 0. Find the number of active nuclei at time t.


Obtain a relation between the half-life of a radioactive substance and decay constant (λ).


Identify the nature of the radioactive radiations emitted in each step of the decay process given below.

`""_Z^A X -> _Z^A  _-1^-4 Y ->_Z^A  _-1^-4 W`


A radioactive substance disintegrates into two types of daughter nuclei, one type with disintegration constant λ1 and the other type with disintegration constant λ2 . Determine the half-life of the radioactive substance.


After 1 hour, `(1/8)^"th"` of the initial mass of a certain radioactive isotope remains undecayed. The half-life of the isotopes is ______.


Two radioactive materials Y1 and Y2 have decay constants '5`lambda`' and `lambda` respectively. Initially they have same number of nuclei. After time 't', the ratio of number of nuclei of Y1 to that of Y2 is `1/"e"`, then 't' is equal to ______.


What is the half-life period of a radioactive material if its activity drops to 1/16th of its initial value of 30 years?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×