In Rutherford’s gold foil experiment, the emitted particles/rays
A) Beta particle
B) Gamma particle
C) X-ray particle
D) Alpha particle
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The centre of mass of two particles system lies (A) at the midpoint on the line joining the two particles.
(D) on the line joining the two particles.
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i. An electron is 1837 times lighter than a proton. ii. In Rutherford’s experiment of scattering of α-particles by thin gold foil,
i. True ii. False, In Rutherford’s experiment of scattering of α-particles by thin gold foil, very few α-particles bounced back. iii. False, Cathode rays are a stream of very small, negatively charged particles.
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On adding a piece of aluminium foil to blue coloured copper sulphate solution, copper will be deposited on aluminium foil. Then the solution
B) Becomes colourless
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Rutherford allowed the alpha particles to pass through ………………. in his alpha particles scattering experiment.
Correct option is D) gold foil
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Out of the X-rays, microwaves, ultra-violet rays, the shortest frequency wave is ……
Correct option is: (B) microwaves
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α-particles scattering experiment helped to detect the existence of the nucleus. The main observation of this experiment is
B) Few no. of alpha particles got deflected.
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On dissolving solid in liquid, ………… particles enter into space between the …………. particles.
B) melting point
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Particles of matter have ………….. between them that keeps the particles together.
B) force of attraction
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Assertion `(A): beta-` particles have greater penetrating power than `alpha-` rays but less than `gamma-`rays. Reason `(R) : beta-` particles are ligh
Correct Answer - A Refer Section
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Spherical gold paricles of radius `10nm`, then the number of gold particles per `mm^(3)` of sol will be
Correct Answer - D Volume of the gold dispresed in one litre water `=("mass")/("density") = (1.9xx10^(-4)g)/(19g cm^(-3)) = 1 xx 10^(5)cm^(-3)` Radius of gold sol particle `=10nm = 10 xx 10^(-9)m...
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