**Part A What is the wavelength of an electron of energy 25eV ? Express your answer…**

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## Question “Part A What is the wavelength of an electron of energy 25eV ? Express your answer…”

**Part A**

What is the wavelength of an electron of energy 25eV ?

Express your answer to two significant figures and include the

appropriate units.

?1 = |

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**Part B**

What is the wavelength of an electron of energy 180eV ?

Express your answer to two significant figures and include the

appropriate units.

?2 = |

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**Part C**

What is the wavelength of an electron of energy 1.0keV ?

Express your answer to two significant figures and include the

appropriate units.

?3 = |

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## Answer

### Answer 1

### Answer 2

A – 50 nm

B- 6.9 nm

C-1.2 nm

### Answer 3

### Answer 4

wavelength = h/m*v

We can also write mv in sqrt(m/2)*K.e (convert K.e to J by multiplying 1.60×10-19).

mv = sqrt(9.11×10^-31/2*25ev*1.60×10^-19J/ev) =1.36*10^-24

wavelength = 6.63×10^-34/1.36*10^-24=0.4875nm

b) mv = sqrt(9.11×10^-31/2*180ev*1.60×10^-19J/ev) =3.4*10^-24

wavelength = 6.63×10^-34/3.4*10^-24=0.1967nm

c) mv = sqrt(9.11×10^-31/2*1000ev*1.60×10^-19J/ev) =.853*10^-24

wavelength = 6.63×10^-34/.853*10^-24=0.777nm

### Answer 5

a)

The wavelength of an electron of energetic energy 25eV is.

here,

b)

The wavelength of an electron of electricity 180eV is.

c)

The energy wavelength of an electron is 1.0 keV.

## Conclusion

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