Variable Mass

[Jaden 14B 3F]

Hello. After the midterm, I am still confused as to why when changing p into mv within the Heisenberg indeterminacy equation, v becomes delta v, but m does not become delta m. I would appreciate it if someone could clarify this. Thanks!

[lilyhoke 2E]

The equation operates under the assumption that there is a level of uncertainty, hence the inequality. However, given that mass is not variable and does not change (the mass of an electron, or the object in question), it is not delta m.

[Gitanjali_Sharma_2D]

Adding on to this, we know the mass of an electron — it is always constant and the same mass, so therefore it is not a source of uncertainty. Velocity on the other hand can change — electrons have the ability to move at different velocities.