Bohr's model explicitly used Planck's constant in quantization of angular momentum and energies.

As temperature increases, atomic vibrations increase, so the amplitude of vibration increases with rise in temperature.

X-rays exhibit interference, diffraction and polarization, but being uncharged they are not deflected by electric fields.

The OCR header indicates option B as the answer for this beta-decay energy range question.

A decay that reduces atomic number by one (P → Si) corresponds to emission of a positron, which has charge +1.

The principal quantum number n primarily determines the energy levels of quantum states, per the provided answer key.

A Geiger-Müller counter detects ionizing (radioactive) radiation such as alpha, beta, and gamma particles.

Ionization smoke detectors commonly use an alpha-emitting source (e.g., americium-241) as per radioactive source applications.

A proton capturing a neutron forms a deuteron (pn) and typically emits a photon (gamma/x-ray) to conserve energy.

From 1600 to 100 in 8 s is a factor 1/16 (three half-lives), so half-life = 2 s; at 6 s (three half-lives from 0? actually 6s = 3 half-lives) activity = 1600*(1/2)^3 = 200 counts/s.