Advertisements
Advertisements
प्रश्न
With the help of a neat labelled diagram, describe the Geiger- Marsden experiment
Advertisements
उत्तर
Geiger–Marsden experiment:
The setup of the Geiger–Marsden experiment is as shown below.
In this experiment, a narrow beam of α-particles from a radioactive source was incident on a gold foil. The scattered α-particles were detected by the detector fixed on a rotating stand. The detector used had a zinc sulphide screen and a microscope.
The α-particles produced scintillations on the screen which could be observed through a microscope. This entire setup is enclosed in an evacuated chamber.
They observed the number of α-particles as a function of scattering angle. Now, the scattering angle is the deviation (θ) of α-particles from its original direction.
They observed that most α-particles passed undeviated and only a few (~0.14%) scattered by more than 1°. Few were deflected slightly and only a few (1 in 8000) deflected by more than 90°. Some particles even bounced back with 180°.
APPEARS IN
संबंधित प्रश्न
Using Rutherford's model of the atom, derive the expression for the total energy of the electron in hydrogen atom. What is the significance of total negative energy possessed by the electron?
Thorium 90Th232 is disintegrated into lead 82Pb200. Find the number of α and β particles emitted in disintegration.
The size of the atom in Thomson’s model is ______ the atomic size in Rutherford’s model.
A classical atom based on ______ is doomed to collapse.
An atom has a nearly continuous mass distribution in a ______ but has a highly non-uniform mass distribution in ______.
Define the distance of closest approach. An α-particle of kinetic energy 'K' is bombarded on a thin gold foil. The distance of the closest approach is 'r'. What will be the distance of closest approach for an α-particle of double the kinetic energy?
Alpha particles used in Geiger-Marsden experiment were obtained from ______.
In Geiger-Marsden experiment prediction was that ______.
The model that best explains the results of Geiger-Marsden experiment is ______.
The first line of Balmer series (Hα) in the spectrum of hydrogen is obtained when an electron of hydrogen atom goes from ______.
As compared to 12C atom, 14C atom has ______.
Which one of the following statements does not hold good when two balls of masses m1 and m2 undergo elastic collision?
Which of the following transition in a hydrogen atom emit photon of the highest frequency:
The ratio active Nude 7N13 decays 6C13 through the emission of
The ratio of minimum to maxm wavelength in ballmer series is:-
Assume that there is no repulsive force between the electrons in an atom but the force between positive and negative charges is given by Coulomb’s law as usual. Under such circumstances, calculate the ground state energy of a He-atom.
Draw a graph showing the variation of the number of particles scattered (N) with the scattering angle θ in the Geiger-Marsden experiment. Why only a small fraction of the particles are scattered at θ > 90°?
The energy levels of a certain atom for first, second and third levels are E, 4E/3 and 2E, respectively. A photon of wavelength λ is emitted for a transition 3 `→` 1. What will be the wavelength of emission for transition 2 `→` 1?
According to Bohr model, magnetic field at centre (at the nucleus) of a hydrogen atom due to motion of electron in the ninth orbit is proportional to:
If λa, λb and λc represent the Kα, Kβ and Lα transition wavelengths in a hydrogen atom, respectively. Then which of the following is correct?
The shortest wavelength of the Brackett series of a hydrogen like atom of atomic number Z is same as the shortest wavelength of the Balmer series of hydrogen atom, then the value of Z is ______.
Radius of the 1st orbit of hydrogen atom is r0. What will be the radius of the 4th orbit?
