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5 Cards in this Set

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Explain why the emitted electrons have a range of kinetic energies up to a maximum value.

* energy required for electron to leave/escape/emit from the surface/metalOR electron has to overcome work function




* maximum kinetic energy is the energy of photon minus the workfunction




*deeper electrons require energy to get to the surface OR have less Ek than surface electrons

Rifle B is fired and the bullet emerges with a smaller horizontal velocity than the bulletfrom rifle A.



Explain why the horizontal distance travelled by bullet B will be less than bullet A.

* their vertical motion is independent of their horizontalmotionOR downward /vertical acceleration is the same for bothOR acceleration due to gravity is the same for bothOR vertical speed/velocity is the same for both



* (bullets A and B will be in the air) for the same time




* (Horizontal acceleration is zero and thus horizontal)distance is proportional to horizontal speed OR s = utwhere u is the horizontal velocity

Hadrons and leptons are two groups of particles. Write an account of how particles are placed into one or other of these two groups.Your account should include the following:



* How the type of interaction is used to classify the particles


* Examples of each type of particle


* Details of any similarities between the two groups


* Details of how one group may be further sub-divided.

* Candidate gives correct examples of hadrons and leptons
* Identifies thedifferences between hadrons and leptons (hadrons affected by strongnuclear reaction and are made of quarks). Leptons are fundamental anddo not experience the strong nuclear reaction. Hadrons are divided intobaryons and mesons. Baryons three quarks, mesons quark anti-quarkpair.
* Similarities between groups all experience weak interaction and ifcharged the electromagnetic interaction. All have rest mass.

Mass of an Electron

9.11 x 10^-31

Strong Nuclear Force graph