Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Ca

step 1 Hello, students. In this question, the electromagnetic radiation of wavelength lambda equals to

Electromagnetic radiation of wavelength 242 nm is just...

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Key Concepts

Molar Energy Conversion

When dealing with energies on the atomic scale, it is often necessary to convert the energy per photon to energy per mole by multiplying by Avogadro's constant. This conversion bridges the gap between microscopic quantum events and macroscopic measurements, allowing for consistent units such as kilojoules per mole in chemical calculations.

Ionisation Energy

Ionisation energy refers to the minimum amount of energy required to remove an electron from an isolated atom or molecule in its gaseous state. It is a critical parameter in atomic physics and chemistry, influencing the reactivity and chemical behavior of elements.

Photon Energy Calculation

The energy of a photon is determined by its wavelength using the equation E = hc/?, where h is Planck's constant and c is the speed of light. This formula directly links the measurable property of light, its wavelength, with its quantized energy, making it fundamental in calculating energy interactions at the atomic scale.

Electromagnetic Radiation

Electromagnetic radiation consists of waves that transport energy through space, and its energy is quantized in the form of photons. This concept is central to understanding processes where light interacts with matter, such as the ionisation of atoms, and forms the basis for many quantum and spectroscopic phenomena.

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