Atomic Structure
Which of the following results is not true about photoelectric effect?
The electrons are ejected from the metal surface as soon as the beam of light strikes to the surface.
The number of electrons ejected is proportional to the intensity or brightness of light.
There is a time lag between the striking of light beam and the ejection of electrons from the metal surface.
For each metal, there is a characteristic minimum frequency below which photoelectric is not observed.
Which of the following statements is not true about Thomson's model of atom?
This model can be visualised as a pudding or watermelon of positive charge with plum or seeds as electrons embedded into it.
The mass of the atom is assumed to be uniformly distributed over the atom.
An atom possesses a spherical shape in which the positive charge in uniformly distributed.
This model could not explain the overall neutrality of the atom.
Which of the following statements is not the result of cathode ray discharge tube experiment with perforated anode?
In the absence of electric or magnetic field, the cathode rays travel in straight line.
In the presence of electric or magnetic field, the behaviour of cathode rays is similar to that expected from negatively charged particles.
In the presence of electric and magnetic field, the cathode rays travel in straight line.
The cathode rays starts from the cathode and move toward the anode.
The degeneracy of the level of hydrogen atoms that contain the energy of $\left(\frac{-R_{\mathrm{H}}}{16}\right)$ is
4
16
9
12
Wavelength of $\mathrm{H}^{+}$ion with kinetic energy 1.65 eV is (mass of proton $=1.6726 \times 10^{-27} \mathrm{~kg}$ )
1.22 nm
0.22 nm
0.022 nm
0.122 nm