When $\alpha$-particles are sent through a thin metal foil,most of them go straight through the foil because
- A$\alpha$-particles are much heavier than electrons
- B$\alpha$-particles are positively charged
- Cmost part of the atom is empty space
- D$\alpha$-particles move with high velocity
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An electronic transition in a hydrogen atom results in the formation of the $H_\alpha$ line of the hydrogen spectrum in the Lyman series. The energies associated with the electron in each of the orbits involved in the transition (in $kcal \ mol^{-1}$) are:
The expression for Bohr's radius of an atom is
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View SolutionWhat is the value of the frequency of radiation when a transition occurs between two stationary states that differ in energy by $\Delta E$?
$A$ bulb is rated at $150 \text{ W}$,converting $8\%$ of its energy into light. If the energy of one photon is $4.42 \times 10^{-19} \text{ J}$,how many photons are emitted by the bulb per second?
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View SolutionFind the frequency and wavelength of light required for the ionization of the solution. (Ionization energy of the solution $= 8.2 \times 10^{-19} \ J$)
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