i suck at pp3 Flashcards
Stefan Boltzmann law
T = 4π σ r^2 T^4
Units for d = 1/p
d is in Parsecs
1 is in Astronomical Units
p is in Arcseconds
Cosmological Principle
The universe is isotropic and homogeneous at a sufficiently large scale.
Isotropic definition
Identical in all directions.
Homogeneous definition
Identical at all points.
Time period of an oscillating pendulum
T = 2π sqrt(l / g)
Time period of an oscillating spring
T = 2π sqrt(m / k)
Equation for capacitance of two parallel plates
ε = ε A / d
Motion of X-ray emitter during a CAT scan
Rotates around the patient at very high speeds while slowly moving up their body (patient is inside a tube).
CAT scan full name
Computerised Axial Tomography
How is exposure to X-rays minimised during CAT scan?
The X-ray source is passed through slit that concentrates it into a very thin fan shape.
How can a CAT scan colour different mediums differently?
It can identify them based on their attenuation coefficients.
Tracer definition
A radioactive substance to be ingested or injected that emits gamma photons to be detected by a gamma camera.
Gamma camera
A camera that detects gamma photons to produce a real-time image as the tracer passes through the body.
Example of a compound used as a tracer
Technetium-99m
