Question

what does plancks equation $e = h \times \
u$ determine?

• the color of the lines on the atomic spectrum for an atom
• the energy released as an electron moves to a lower orbital
• the number of lines on the atomic spectrum for an atom
• the energy released as an electron moves to a higher orbital

Explanation:

1. Recall Planck's equation \( E = h \times

u \) (where \( E \) is energy, \( h \) is Planck's constant, and \(
u \) is frequency).

1. Analyze each option:

• The color of atomic spectrum lines relates to frequency/wavelength, but the equation itself doesn't determine color directly (it relates energy to frequency). Eliminate the first option.
• When an electron moves to a lower orbital, it releases energy. The energy of the photon emitted (or absorbed) can be calculated using \( E = h

u \). This matches the equation's use.

• The number of lines in an atomic spectrum is determined by electron transitions between energy levels (quantum states), not by Planck's equation. Eliminate the third option.
• Moving to a higher orbital requires energy absorption, not release. Eliminate the fourth option.

Answer:

the energy released as an electron moves to a lower orbital