Assessment part 3

A measure of how close a measurement is to the true value.

• Accuracy

• Precision

• Resolution

• Repeatable

A measure of how close a measurement is to the mean value. It only gives an indication of the magnitude of random errors, not how close data is to the true value. A measure of how close a measurement is to the mean value. It only gives an indication of the magnitude of random errors, not how close data is to the true value.

• Accuracy

• Precision

• Resolution

• Repeatable

Unpredictable variation between measurements that leads to a spread of values about the true value. Random error can be reduced by taking repeat measurements.

• Accuracy

• Precison

• Random error

• Systematic error

Causes all readings to differ from the true value by a fixed amount. Systematic error cannot be corrected by repeat readings, instead a different technique or apparatus should be used.

• Reproducible

• Systematic error

• Repeatable

• Uncertainty

The interval that a value is said to lie within, with a given level of confidence.

• Reproducible

• Systematic error

• Resoultion

• Uncertainty

A quantum number that is conserved in all particle interactions. Baryons have a baryon number of +1 and non-baryons have a baryon number of 0.

• Charge

• Baryon number

• Lepton number

• Strangeness

Particles that are produced through the strong interaction but decay through the weak interaction.

• Leptons

• Strange particles

• Protons

• Muons

The minimum energy required to remove an electron from a metal’s surface.

• Threshold frequency

• Ionisation

• Excitation

• Work function

The minimum frequency of photons required for photoelectrons to be emitted from the surface of a metal plate through the photoelectric effect. It is equal to the metal’s work function divided by Planck’s constant.

• Threshold frequency

• Ionisation

• Work function

• Excitation

The process of a sufficiently high-energy photon converting into a particle and its corresponding antiparticle. To conserve momentum, this usually occurs near a nucleus.

• Gauge boson

• Pair production

• Alpha decay

• Pair annihilation