Home
Class 12
PHYSICS
a. For the calculation of average angle ...

a. For the calculation of average angle of scattering of a particles by a thin foil, why multiple scattering cannot be ignored in Thomson's model?
b. Name the model in which it can be ignored.
c. The majority of a particles pass through gases with no deflections. To what conclusion about the atomic structure does this observation lead?

Text Solution

Verified by Experts

a. Positive charge is uniformly distributed in the whole atom of the Thomson.s model. If only single collision is considered, it cannot cause large deflection, so multiple scattering is considered to calculate average angle of scattering. Thus multiple scattering cannot be ignored in Thomson.s model.
b. It can be ignored in Rutherford.s model because scattering is mainly because of single collision in this model.
c. This observation leads to the conclusion that most of the space in the atom is empty.
Promotional Banner

Topper's Solved these Questions

  • ATOMS

    NEW JOYTHI PUBLICATION|Exercise CONTINUOUS EVALUATION|2 Videos

  • ATOMS

    NEW JOYTHI PUBLICATION|Exercise PREVIOUS YEAR QUESTION|1 Videos

  • ATOMS

    NEW JOYTHI PUBLICATION|Exercise SOLUTIONS TO EXERCISES FROM NCERT TEXT|12 Videos

  • ALTERNATING CURRENT

    NEW JOYTHI PUBLICATION|Exercise OBJECTIVE TYPE QUESTION|7 Videos

  • CURRENT ELECTRICITY

    NEW JOYTHI PUBLICATION|Exercise COMPETITIVE EXAM CORNER|37 Videos

Similar Questions

Explore conceptually related problems

Answer the following questions, which help you to understand the difference between Thomson's model and Rutherford's model better. a. Is the average angle of deflection of a-particles by a thin gold foil predicted by Thomson's model much less, about the same, or much greater than that predicted by Rutherford's model? b. Is the probability of backward scattering (i.e., scattering of a-particles at angles greater than 90^@ ) predicted by Thomson's model much less, about the same, or much greater than that predicted by Rutherford's model? c. Keeping other factors fixed, it is found experimentally that for small thickness t, the number of alpha - particles scattered at moderate angles is proportional to t.What clue does this linear dependence on t provide? d. In which model is it completely wrong to ignore multiple scattering for the calculation of average angle of scattering of alpha particles by a thin foil?

For scattering by an 'inverse square field' (such as that produced by a charged nucleus in Rutherford's model) the relation between impact parameter b and the scattering angle theta is given by b (Ze^2 cot (theta/2))/(4 pi epsi_0 ((mv^2)/(2))) a. What is the scattering angle for b =0? b. For a given impact parameter h, does the angle of deflection increase or decrease with increasing energy? c .What is the impact parameter at which the scattering angle is 90^@ for Z = 79 and initial energy of 10 MeV? d. Why is it that the mass of the nucleus does not enter the formula above but the charge does? e. For a given energy of the projectile, does the scattering angle increase or decrease with decrease in impact parameter?

A particle of mass m is kept on the top of a smooth sphere of radius R. It is given a sharp impulse which imparts it a horizontal speed v. a. find the normal force between the sphere and the particle just after the impulse. B. What should be the minimum value of v for which the particle does not slip on the sphere? c. Assuming the velocity v to be half the minimum calculated in part, d. find the angle made by the radius through the particle with the vertical when it leaves the sphere.