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Space
Motors and Generators
Ideas
Medical Physics
Calculations
100
The mass of an object that is not moving.
What is the definition of rest mass?
100
A force experienced by a current carrying conductor in an external magnetic field.
What is the motor effect?
100
An object that emits radiation with a frequency dependent on its temperature.
What is a Black Body?
100
The measure of how readily sound will pass through a material.
What is acoustic impedance?
100
The energy of a UV photon with a wavelength of 3.00 x 10^-7 m.
What is 6.63 x 10^-19 J?
200
The horizontal and verticle components of a projectile's motion are this.
What is independent?
200
A current beneficial use of eddy currents.
Induction heating, Electromagnetic braking,
200
J J Thomsons experiment.
A cathode tube with both an electric and magnetic field forcing the ray in opposite directions with equal force. It was used to find the charge to mass ratio of the electron.
200
The Larmor frequency.
What is the name given to the frequency that protons will precess at in an external magnetic field?
200
The percentage of reflected ultrasound between a fat/muscle boudary. Z(fat)=1.38 x 10^6 kg/m^2/s Z(muscle) = 1.70 x 10^6 kg/m^2/s
What is 11%?
300
The force that keeps objects in orbit.
What is Centripetal force? What is Weight?
300
The amount of magnetic field passing through a given area.
What is magnetic flux?
300
The release of electrons from a metal surface exposed to electromagnetic radiation.
What is the photoelectric effect?
300
Xrays are absorbed by the introduced substance allowing soft tissue to be imaged.
What is the purpose of a contrasting agent being introduced during an Xray or CAT scan?
300
The number of turns in the primary coil of a transformer which recieves 240 V and steps the voltage down to 12 V with a current of 500mA.
What is 600?
400
The slingshot effect.
What is the strategy which uses the gravitational attraction of a planet to change the velocity of a space probe with minimal use of fuel.
400
Lenz's Law
Who's law states that 'an induced emf always gives rise to a current that creates a magnetic field that opposes that original change in flux through a circuit?
400
The BCS theory.
What is the theory that electrons can form copper pairs due to a distortion in the positive lattice in some materials that are below a critical temperature?
400
A PET scan.
What is the name of the imaging technique that requires the pateint to be injected with a positron emitting radiapharmaceutical that follows a natural metabolic pathway. The positrons interact with electrons creating 2 gamma rays that are detected. the origin of the rays are calculated creating an image.
400
The range of a tennis ball that is hit with a velocity of 25 m/s at an angel of 15 degrees above the horizontal.
What is 32 m?
500
Einsteins thought experiment.
An observer on a platform sees a train travel past at near the speed of light when lightning hits the ends of the trains simultaneously. A passenger in the train sees the lightning hit the train at different times, the one at the front of the train hits the train first.
500
A machine in which torque is produced by the interaction of a rotating magnetic field produced by the stator and currents in the stator?
What is an AC induction motor?
500
Max Planck's contribution to quantum physics.
hypothesised that thee radiation emitted and absorbed by the walls of a blcakbody cavity is quantised.
500
One scan technique uses electromagetic radiation to pass through the patient, the other detects electromagnetic radiation that has been produced inside the body externally.
What is the main difference between the use of electromagnetic radiation in Xrays and PET scans?
500
The length of a platform measure by an observer in a train travelling past at half the speed of light if a person on the platform measures it to be 30 m long.
What is 25.98 m?