## LOG#175. BH and Saint Seiya: Infinite Break and beyond!

This post contains some exercises and challenges for you. In fact, crazy me, I used some of them for my classroom usage (just a fun way to survive is to design and propose maniac ultrageek problems to your students, … Continue reading

## LOG#040. Relativity: Examples(IV).

Example 1. Compton effect. Let us define as  “a” a photon of frequency . Then, it hits an electron “b” at rest, changing its frequency into , we denote “c” this new photon, and the electron then moves after the … Continue reading

## LOG#039. Relativity: Examples(III).

Example 1. Absorption of a photon by an atom. In this process, we have from momenergy conservation: If the atom is the rest frame, before absorption we get Description: an atom “a” at rest with mass absorbs a photon “b” … Continue reading

## LOG#038. Relativity: Examples(II).

Example 1. Completely inelastic collision of 2 particles . We will calculate the mass and velocity after the collision, when a cluster is formed. From the consevation of momentum in the collision, we get Then, Squaring both sides: In the … Continue reading

## LOG#037. Relativity: Examples(I)

Problem 1. In the S-frame, 2 events are happening simultaneously at 3 lyrs of distance. In the S’-frame those events happen at 3.5 lyrs. Answer to the following questions: i) What is the relative speed between frames? ii) What is … Continue reading