# physicists often use a different unit of energy, the electron volt, when dealing with energies at the atomic level. one electron volt, abbreviated ev, is defined as the amount of kinetic energy gained by an electron upon accelerating through a 1.0 v potential difference.

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get physicists often use a different unit of energy, the electron volt, when dealing with energies at the atomic level. one electron volt, abbreviated ev, is defined as the amount of kinetic energy gained by an electron upon accelerating through a 1.0 v potential difference. from EN Bilgi.

## An electron volt (eV) is a unit of energy equal to $$ 1.6

Find step-by-step Physics solutions and your answer to the following textbook question: An electron volt (eV) is a unit of energy equal to $$ 1.6 \times 10 ^ { - 19 } \mathrm { J } $$ . An electron has a kinetic energy of 2.5 eV. a. How many joules is that? b. What is the energy in eV of an electron that has an energy of $$ 8.6 \times 10 ^ { - 18 } \mathrm { J } $$ ?.

### Question

An electron volt (eV) is a unit of energy equal to

1.6 \times 10 ^ { - 19 } \mathrm { J }

1.6×10 −19 J

. An electron has a kinetic energy of 2.5 eV. a. How many joules is that? b. What is the energy in eV of an electron that has an energy of

8.6 \times 10 ^ { - 18 } \mathrm { J }

8.6×10 −18 J ?

### Explanation

Verified \textbf{.a)}

.a) We are given that

[1 \mathrm{~ eV}=1.6 \times 10^{-19} \mathrm{~ J}]

[1 eV=1.6×10 −19 J], so the (2.5 \mathrm{~ eV})

(2.5 eV) can be converted to (J) as follows

2.5 \mathrm{~ eV} \times \frac{1.6 \times 10^{-19} \mathrm{~ J}}{1 \mathrm{~ eV}}=4 \times 10^{-19} \mathrm{~ J}

2.5 eV× 1 eV 1.6×10 −19 J =4×10 −19 J \line(1,0){370} \textbf{.b)} .b)

8.6 \times 10^{-18}\mathrm{~ J} \times \frac{1 \mathrm{~ eV}}{1.6 \times 10^{-19} \mathrm{~ J}}=53.75 \mathrm{~ eV}

8.6×10 −18 J× 1.6×10 −19 J 1 eV =53.75 eV

Round the answer to two significant figure

\text{Energy}=54 \mathrm{~ eV}

Energy=54 eV

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### Related questions

CHEMISTRY

The electron volt (eV) is a convenient unit of energy for expressing atomic-scale energies. It is the amount of energy that an electron gains when subjected to a potential of 1 volt;

1 \mathrm{eV}=1.602 \times 10^{-19} \mathrm{J}

1eV=1.602×10 −19

J. Using the Bohr model, determine the energy, in electron volts, of the photon produced when an electron in a hydrogen atom moves from the orbit withn= 5 to the orbit with n= 2. Show your calculations.

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Physicists often use a different unit of energy, the electron volt, when dealing with energies at the atomic level. One electron volt, abbreviated eV, is defined as the amount of kinetic energy gained by an electron upon accelerating through a 1.0 V potential difference. a. What is 1.0 electron volt in joules? b. What is the speed of a proton with 5000 eV of kinetic energy?

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Calculate the speed of an electron with a kinetic energy of 1.00 electron volt (eV).

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An X-ray photon of wave length 0.989 nm strikes a surface. The emitted electron has a kinetic energy of 969 eV. What is the binding energy of the electron in kJ/mol?

\left[\mathrm{KE}=\frac{1}{2} m v^{2} ; 1 \text { electron volt }(\mathrm{eV})=1.602 \times 10^{-19} \mathrm{J}\right]

[KE= 2 1 mv 2

;1 electron volt (eV)=1.602×10

−19 J]

## Solved Problem 25.20 Part A Physicists often use a different

Answer to Solved Problem 25.20 Part A Physicists often use a different

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## Joule to Electron Volt Conversion Example Problem

This example problem demonstrates how to convert joules to electron volts. Learn the solution to this problem and other related Chemistry equations.

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## Joule to Electron Volt Conversion Example Problem

Joule to Electron Volt Conversion Example Problem Worked Chemistry Problems

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The Joule and electron volt are units of energy. LAWRENCE LAWRY / Getty Images

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Updated on February 07, 2019

Joules (J) and electron volts (eV) are two common units of energy. This example problem demonstrates how to convert joules to electron volts.

When working with energy values typical for the atomic scale, the joule is too large of a unit to be effective. The electron volt is a unit of energy suited to energies involved in atomic studies. The electron volt is defined as the total amount of kinetic energy gained by an unbound electron as it is accelerated through a potential difference of one volt.

The conversion factor is 1 electron volt (eV) = 1.602 x 10-19 J

**Problem:**

The ionization energy of a hydrogen atom is 2.195 x 10-18 J. What is this energy in electron volts?

**Solution:**

x eV = 2.195 x 10-18 J x 1 ev/1.602 x 10-19 J x eV = 13.7 eV

**Answer:**

The ionization energy of a hydrogen atom is 13.7 eV.

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