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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Light is given off by a sodium- or mercury-containing streetlight when the atoms are excited. The light you see arises for which of the following reasons?

(a) Electrons are moving from a given energy level to one of higher energy.

(b) Electrons are being removed from the atom, thereby creating a metal cation.

(c) Electrons are moving from a given energy level to one of lower energy

Interpretation Introduction

Interpretation: The reason for light arising in the streetlight has to be determined from the given option.

Concept introduction:

Electromagnetic radiations are a type of energy surrounding us. They are of different types like radio waves, IR, UV, X-ray etc.

Visible light lies between the wavelength 400nm and 700nm

images

Explanation

Reason for correct option

As the electric current is applied, the sodium or mercury atoms in streetlight gets excited and comes to ground state by releasing energy as light.

The sodium or mercury atoms in streetlight get excited by gaining energy and thus making these atoms highly unstable. To reach the ground state, it releases energy in the form of light.

The energy emitted by the sodium or mercury atoms is in the visible light region of electromagnetic spectrum.

Therefore, electrons that moving from a given energy level to one of lower energy causes the light to arise in the streetlight

Hence the correct option for the reason for light arising in the streetlight is option c...

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