What is the wavelength in pm of an electron traveling at 60% the speed of light?

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Discussion Overview

The discussion revolves around calculating the wavelength of an electron traveling at 60% of the speed of light, focusing on the relevant equations and the values needed for mass in this context.

Discussion Character

  • Homework-related, Mathematical reasoning, Debate/contested

Main Points Raised

  • One participant seeks clarification on the mass value needed for the wavelength calculation, expressing uncertainty about whether a specific mass for electrons is required.
  • Another participant asserts that the mass of electrons is constant, suggesting that variations in previous examples may stem from differences in measurement units or significant figures.
  • A question is posed regarding the equation for mass increase as a function of velocity, specifically at 0.6c.
  • Another participant reiterates the constancy of electron mass and introduces the concepts of invariant mass and relativistic mass.

Areas of Agreement / Disagreement

Participants express differing views on the constancy of electron mass, with some asserting it remains the same while others question its application in the context of relativistic effects. The discussion remains unresolved regarding the implications of mass in the wavelength calculation.

Contextual Notes

There is a lack of consensus on the appropriate mass value to use in the wavelength calculation, and the discussion touches on the distinction between invariant and relativistic mass without reaching a definitive conclusion.

Knight226
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Homework Statement


Calculate the wavelength, in picometers, associated with an electron traveling 60.0% of the speed of light.

Homework Equations



Wavelength = h / (mv)

The Attempt at a Solution


I know the h value.
The v value I believe it is 60.0% of 3.00 x 10^8
But what is the m value? If the m value isn't given, then the equation can't be solved, can it?
Is there a specific number for the m value?

From the examples I have seem, the m for electrons are always different.

Please help. Thanks in advance.
 
Last edited:
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On the contrary, I am quite confident that the masses of electrons are always the same. It is the energy of electrons that changes.

The only time in which electrons may seem to have different masses in different questions are when an unfamiliar unit of measurement is used, or a different amount of significant figures is used. Nonetheless, the values should be relatively the same.
 


What is the equation for mass increase as a function of velocity? How much does the mass increase at 0.6c?
 


windwitch said:
On the contrary, I am quite confident that the masses of electrons are always the same.

Google invariant mass and relativistic mass.

--
methods
 

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