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Suppose that an annihilation event occurs on the line 3 $\mathrm{cm}$ from the center of the line connecting the two photodetectors that receive the resultant $x$ rays. Often, a section of the whole brain is being imaged, so the $x$ rays do not come from a point source. Will those photons be counted as having arrived simultaneously?A. No, because the time difference will be 100 $\mathrm{ms}$ .B. No, because the time difference will be 200 $\mathrm{ms}$ .C. Yes, because the time difference will be 0.1 $\mathrm{ns}$ .D. Yes because the time difference will be 0.2 $\mathrm{ns}$ .

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Physics 103

Chapter 30

Nuclear and High-Energy Physics

Atomic Physics

Nuclear Physics

Particle Physics

Cornell University

Simon Fraser University

McMaster University

Lectures

02:42

Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change. The theory of quantum mechanics, a set of mathematical rules that describe the behaviour of matter and its interactions, provides a good model for the description of atomic structure and properties.

02:26

In physics, nuclear physics is the field of physics that studies the constituents and interactions of atomic nuclei. The most commonly known applications of nuclear physics are nuclear power generation and nuclear weapons technology, but the research has provided application in many fields, including those in nuclear medicine and magnetic resonance imaging, ion implantation in materials engineering, and radiocarbon dating in geology and archaeology.

01:01

Suppose that an annihilati…

05:48

Suppose that positron-elec…

04:59

Pair Annihilation. Conside…

04:22

(a) Two annihilation $\gam…

04:33

Two equal-energy photons c…

11:44

03:54

Same two observers as in t…

05:53

Consider the case where a…

07:32

Pair annilation. Consider …

05:25

01:37

03:09

An electron-positron pair,…

02:03

So in this country we have an event, a curse. So also lying. So this this isn't so. This isn't said, assuming this is a line with your photo detectors. Is this white detective? This is the best protection since in the centre we have an event that occurs all the lights that three centimetres from the center is in. We ask whether these two photos will be caught it as heavy arrived some potatoes here. So this sissy za passed to the detector. So it's freezing your frog, sir. Sent her. But it's a difference in the past. It's actually six, Ademir, because R is this much This pass is this much longer? Since this pass, uh, so's a past differences success here in Liza question. We're told that all right, the index of refraction of biological tissue is equal to what So when exactly is that for speed applied, which is equal to the speed of light is here for the palace. Um, actually, that's will be equal to the speed of light. So the speed of light as a tissue is equal to the spittle flying air, which is our familiar three times since he's eight liters person I saw. The time difference is a past differences over speed. We chance 0.6 leader at last three types tend to Z eight liters per second, said a 0.2 nanosecond causes two times two into the next intensity. And this question is's. The special of detection is $10 Egor says. Is smaller is a tangible second, so the two bottles will be counted is arriving simultaneously. So this again is triste E. Yes, there will be countenance around me. 17 is sweet because the time difference is always filled with $2 ago.

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