JEE · Physics · Atoms doubts
8 doubts found
How can I quickly decide the longest-wavelength line in a hydrogen spectral series?
Within one named series, the final level n_f is fixed.
Why is hydrogen's ground-state energy negative, and how much energy ionises it?
We define a stationary electron and proton infinitely far apart as zero energy.
What does “Rutherford scattering and nuclear atom” actually mean in Atoms, and why does it matter for JEE?
Most alpha particles pass through foil because atoms are mostly empty space; rare large deflections show that positive charge and most mass occupy a tiny nucleus.
I keep getting “Rutherford scattering and nuclear atom” questions wrong in Atoms. What's the trap?
claiming Rutherford's model explains atomic stability or line spectra.
What does “Bohr's quantised orbits” actually mean in Atoms, and why does it matter for JEE?
Bohr allowed only orbits with angular momentum n h/(2pi). An electron in a stationary orbit does not radiate; light is emitted or absorbed only during a transition.
I keep getting “Bohr's quantised orbits” questions wrong in Atoms. What's the trap?
imagining an electron radiating continuously while remaining in an allowed orbit.
What does “Hydrogen energy levels” actually mean in Atoms, and why does it matter for JEE?
Hydrogen bound-state energies are negative because zero is assigned to a free electron at infinity. Larger n means less negative energy and weaker binding.
I keep getting “Hydrogen energy levels” questions wrong in Atoms. What's the trap?
thinking n = infinity is the most tightly bound state.