Rutherford's $\alpha$-particle scattering experiment eventually led to the conclusion that

  • A
    Mass and energy are related
  • B
    Electrons occupy space around the nucleus
  • C
    Neutrons are buried deep in the nucleus
  • D
    The point of impact with matter can be precisely determined

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Which observations are not explained by the electromagnetic theory of physics?

The value of Rydberg constant $\left(R_H\right)$ is $2.18 \times 10^{-18} \ J$. The velocity of an electron having mass $9.1 \times 10^{-31} \ kg$ in Bohr's first orbit of a hydrogen atom $= \dots \dots \dots \times 10^5 \ ms^{-1}$ (nearest integer).

For the Paschen series, the values of $n_1$ and $n_2$ in the expression $\Delta E = R h c \left( \frac{1}{n_1^2} - \frac{1}{n_2^2} \right)$ are:

Which of the following is correct for the Humphrey series of the hydrogen spectrum?

The wavelength of the radiation emitted,when in a hydrogen atom an electron falls from infinity to stationary state $n = 1$,would be ........ $nm$ (Rydberg constant $R_H = 1.097 \times 10^7 \ m^{-1}$)

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