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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$A$ metal having a work function of $4 \, eV$ is exposed to a photon of $\lambda = 1240 \, \mathring{A}$. If an accelerating potential of $7.6 \, V$ is applied,then the electron with maximum kinetic energy will have a speed equal to -
Thomson's atomic model is also known as .....
Easy
View SolutionSupposing the energy (in arbitrary units) of the energy levels in the hydrogen atom is given as under:
Energy level $K$ $(n=1)$ $L$ $(n=2)$ $M$ $(n=3)$ $N$ $(n=4...n=\infty)$ Energy $-864 \ a.u.$ $-216 \ a.u.$ $-96 \ a.u.$ $0 \ a.u.$
The excitation energy needed to raise the electron from $M$ level to $n = \infty$ would be:
| Energy level | $K$ $(n=1)$ | $L$ $(n=2)$ | $M$ $(n=3)$ | $N$ $(n=4...n=\infty)$ |
| Energy | $-864 \ a.u.$ | $-216 \ a.u.$ | $-96 \ a.u.$ | $0 \ a.u.$ |
The excitation energy needed to raise the electron from $M$ level to $n = \infty$ would be:
Medium
View SolutionWhen an electron with energy $10.8 \,eV$ collides with a hydrogen $(H)$ atom,what will happen?
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View SolutionThe first use of quantum theory to explain the structure of the atom was made by
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