Recent content by jjson775

  1. jjson775

    I Energy*time uncertainty for particle decay

    Is the DeBroglie wavelength still a valid concept?
  2. jjson775

    I Energy*time uncertainty for particle decay

    I would appreciate an example of a topic in the “basics of the QM framework”.
  3. jjson775

    I Energy*time uncertainty for particle decay

    I don’t know what “basic QM” is but am happy to have gained some insight into quantized energy, wave particle duality, the Schrödinger equation etc. I am continually learning more all the time, eg., the shaky nature of energy time uncertainty!
  4. jjson775

    I Energy*time uncertainty for particle decay

    My question came from a homework problem from Modern Physics, Serway Chapter 5, Matter Waves. Yes, not a real QM textbook.
  5. jjson775

    I Energy*time uncertainty for particle decay

    Thanks. This answered my question.
  6. jjson775

    I Energy*time uncertainty for particle decay

    Thanks for the responses. In retrospect I should have posted this as introductory physics homework help. I am not at the level of the discussion in this thread. I love learning about modern physics but am limited to calculus and differential equations, no linear algebra or multi variable...
  7. jjson775

    I Energy*time uncertainty for particle decay

    To clarify, I studied “classical” physics 60+ years ago as an engineering student. In recent years, I have studied modern physics, relativity, Planck, the basics of QM, etc.
  8. jjson775

    I Energy*time uncertainty for particle decay

    What?? I am shocked. Among others, I went through the modern physics chapters of Young and Freedman, 14th edition 2016, supposedly the successor to Sears and Zemansky when I studied physics (classical) over 60 years ago. Have they dropped this (E,t uncertainty)? How about position and momentum?
  9. jjson775

    I Energy*time uncertainty for particle decay

    Sorry for the sloppy post. Nevertheless, I am confused by your reply. I am a retired engineer, 83 years old, self studying modern physics. All of the textbooks I use show the uncertainty principle for the energy and time interval: ΔEΔt ≥ h bar/2. My question is how to calculate the fractional...
  10. jjson775

    I Energy*time uncertainty for particle decay

    If a particle decays into two gamma rays, what is the energy time uncertainty? ΔEΔt = h bar or ΔEΔt = h bar/2 Please explain.
  11. jjson775

    I How Does Technetium-99 Appear in Red Giants Beyond the Iron Peak?

    My question arose from a straightforward problem showing how the technetium could not have been present in the star from the beginning, because of radioactive decay. To test my understanding, the technetium was formed in the star by the endoergic s-process. Elements up to the iron peak can be...
  12. jjson775

    I How Does Technetium-99 Appear in Red Giants Beyond the Iron Peak?

    Technetium 99 was detected by spectroscopy in a red giant. How did it get there if it is heavier than the “iron peak”, the upper limit for fusion?
  13. jjson775

    I Why do exponential functions occur outside of finite walls?

    Your answer is what I was looking for. Thanks. I did take differential equations 60+ years ago but never used it professionally.
  14. jjson775

    I Why do exponential functions occur outside of finite walls?

    Alright. You can’t tell by inspection that the solutions are exponential just because Uo > E is positive, but through solution of the differential equations. I have verified the solutions.
  15. jjson775

    I Why do exponential functions occur outside of finite walls?

    That’s what I said In my post. My reply to PeroK shows my point of confusion. Also, my post has a typo, should have been Uo - E, potential energy > mechanical energy.