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Give a rough estimate of number of a par...

Give a rough estimate of number of a particles which suffer a deflection of `180^@` when made to fall on a gold foil.

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The correct Answer is:
1 in 20000
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In Rutherford experiment, minimum number of a particles will be deflected on using the thin foil of same thickness of which of the following metals?

Assertion: In Rutherford's experiment, a-particles from a sodium source were allowed to fall on a 104 mm thick gold foil. Most of the particles passed straight through the foil. Reason : The entire positive charge and nearly whole of the mass of an atom is concentrated in the nucleus.

In Rutherford formula, maximum number of a-particles deflecting is for which among the following angles theta :

A tangent galvanometer shows no deflection when a current is passed through it. But when the current is reversed, it gives a delfection of 180°, then the plane of the coil should have been oriented:.

The work function (phi) of some metals is listed below . The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is :

In the gold foil experiment of Geiger and Marsden, that paved the way for Rutherford's model of an atom, ~ 1.00% of the alpha -particles were found to deflect at angles gt 50^(@) . If one mole of alpha -particles were bombarded on the gold foil, compute the number of alpha -particles that would deflect at angles less than 50^(@) .

When a silver foil (Z = 47) was used in an alpha ray scattering experiment , the number of alpha -particles scattered at 30^(@) was found to be 200 per minute. If the silver foil is replaced by alumninium (z = 13) foil of same thickness, the number of alpha -particles scattered per minute at 30^(@) is nearly equal to

the protective power of the lyophilic colloids es expressed in terms of gold number, a term introduced by Zsigmondy. Gold number is the number of milli - gram of the protective colloid which prevent the coagulation of 10 mLof red gold sol , when 1 mL of a 10 per cent solution of sodium chloride is added to it . thus smaller the gold number of lyophillic colloid, the greater is the protective power. gold number given an indication of

the protective power of the lyophilic colloids es expressed in terms of gold number, a term introduced by Zsigmondy. Gold number is the number of milli - gram of the protective colloid which prevent the coagulation of 10 mLof red gold sol , when 1 mL of a 10 per cent solution of sodium chloride is added to it . thus smaller the gold number of lyophillic colloid, the greater is the protective power. which of the following statement (S) is / are correct?

A galvanometer having a coil resistance of 100 omega gives a full scale deflection , when a current of 1 mA is passed through it. The value of the resistance, which can convert this galvanometer into ammeter giving a full scale deflection for a current of 10A , is :

ICSE-STRUCTURE OF ATOM-Very Short Answer Type Questions
  1. Among alpha, beta and gamma-rays, which is the most penetrating?

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  2. Who proposed the first model of atom?

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  3. Give a rough estimate of number of a particles which suffer a deflecti...

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  4. If the nucleus of an atom is magnified to the size of a football, how ...

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  5. Give the equation which had been instrumental in the discovery of neut...

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  6. How are the atomic number (Z) and mass number (A) related to each othe...

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  7. Do isobars possess similar chemical properties?

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  8. Why are the waves associated with light called electromagnetic waves?

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  9. Define wavelength and frequency of a wave.

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  10. Among X-rays and microwaves, which does possess a higher wavelength ra...

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  11. Give the wavelengths of D1 and D2 lines of sodium.

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  12. Which transitions are responsible for the occurrence of Brackett serie...

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  13. The Bohr model for the spectra of a H-atom

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  14. Should earth be regarded as a wave in the light of de-Broglie equation...

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  15. What does Psi^2 indicate?

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  16. How many nodal points are present in a 3s orbital?

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  17. Which quantum number does not depend upon the value of n?

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  18. For a given value of l, how many values of m are permissible?

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  19. Which subshell is filled after the filling of 4p subshell?

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  20. If two sushells have the same value of n + 1, which shell will be fill...

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