Calculate wavelength in pm associated with electron traveling 60% of the speed of lig

[Knight226]

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.

 

[windwitch]

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.

 

[berkeman]

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

 

[Borek]

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

Google invariant mass and relativistic mass.

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