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Recall Questions State what is meant by a progressive wave?? A wave that transfers energy from one point in space to another without transferring matter. Compare transverse and longitudinal waves?? In tranverse waves, the oscillations are perpendicular to the direction of energy transfer. In longitudinal waves, the oscillations are parallel to the direction of energy transfer. They consist of compressions and rarefactions. Define the displacement of a wave?? Distance from the equilibrium position in a particular direction.

Recall Questions State Kirchoff’s second law and appreciate that this a consequence of conservation of energy?? Sum of the EMF is equal to the sum of the voltages. What can we say about the current through a component in series. Same for each compoent. What can we say about the p.d. across parallel branches in a circuit?? It is the same for each branch. How do you find the total EMF from cells connected in series with the same polarity?

Recall Questions Define potential difference?? Energy transfer per unit charge from electrical to other forms. Define the volt?? $$1V = 1JC^{-1}$$ Define electromotive force of a source such as a cell or a power supply?? Energy transfer per unit charge from chemical/other to electrical form. Define resistance?? $$\frac{\text{potential difference}}{\text{current}}$$ Define the ohm?? A component has a resistance of $1\Omega$ is a potential difference of $1V$ makes a current of $1A$ flow through it. Define resistivity of a material?

Recall Questions Define current?? Rate of flow of charge. Define the coulomb?? The SI unit of electrical charge. One Coulomb is defined as the amount of charge that passes in 1 second when the current is 1 ampere. What do we mean when we say charge is quantised?? It can only take certain values (always $ne$). If $n$ electrons are removed from a neutral object, what is its charge?? $$ne$$ What is an electrolyte?? A liquid containing charged ions.

Recall Questions State Newton’s first law?? The velocity of an object will only change if a resultant force acts on it. State the ways in which an object’s velocity might change?? An objet may accelerate, decelerate, or change direction. State Newton’s third law (long)?? When two objects interact, they exert forces on each other that are equal in magnitude, opposite in direction and of the same type. State the four features of a Newton’s third law pair of forces?

Recall Questions Define Hooke’s law?? The extension of a spring is directly proportional to the force applied, provided the elastic limit of the spring is not exceeded. Define extension?? The difference between the final and initial length of an object. Define elastic deformation?? The material returns to its original shape and size after any applied forces are removed. Define plastic deformation?? The material will not return to its original shape and size after any applied forces are removed.

Recall Questions Define work done (enerhgy transferred by a force)?? Work done = Force x distance moved in direction of force How much work is done on an object by a force acting at right angles to the direction of motion of an object?? None. Define power?? Rate of work done/Rate of energy transfer Define the Watt?? $$1W = 1Js^{-1}$$ Define the Joule?? Work done to move a force of $1N$ (through) a distance of $1m$ through the point of application.

Recall Questions Define 1N?? The force required to give a mass of $1kg$ an acceleration of $1ms^{-2}$. What is a resultant (net) force?? The vector sum of all the forces acting on an object. What is the relationship between resultant force and acceleration, assuming mass remains constant?? $$F = ma$$ Describe the motion of an object with a resultant force of $0N$ acting on it?? Zero acceleration (therefore stationary or constant velocity). What direction does friction/drag act in?

Recall Questions Define displacement?? Distrance travelled in a particular direction. Define velocity?? Rate of change of displacement. Define acceleration?? Rate of change of velocity. State the units of acceleration?? $$ ms^{-2} $$ Define instantaneous speed?? Displacement $\Delta s$, divided by time for a very short time interval, $\Delta t$. Define average speed?? Total displacement divided by the total time for journey. What does the gradient of a displacement-time graph represent?? Instantaneous velocity. What does the gradient of a velocity-time graph represent?

Flashcards What does $fg(x)$ mean?? $$ f(g(x)) $$ What does $f^2(x)$ mean?? $$ f(f(x)) $$ What does $\alpha \circ \beta (x)$ mean?? $$ \alpha(\beta(x)) $$ If the domain for $g(x) = x^2 - 3$ is $$x \in \mathbb{R}, x \ge 0$$ What is the domain for $gf(x)$ where $f(x) = 5x - 2$?? $$ x \ge \frac{2}{5} $$ Backlinks [[Maths - Syllabus]]S Metadata date: 2021-07-05 11:15 tags: - '@?maths' - '@?

Flashcards 2021-07-05 When is a photon emitted from an atom?? When an electron makes a transition. What is the energy of the photon created when an electron drops an energy level?? The difference in energy between the initial state and the new state. What happens when an electron drops an energy level?? A photon is emitted. Why do simple elements have simpler emission spectra?? There are less electron shells and therefore less possible transitions. What type of spectrum is this?

Flashcards What is the domain of a function?? The set of all possible inputs. What is the range of a function?? The set of all possible outputs. What is the range of a function sometimes called?? The codomain. What is a mapping?? A transformation from one set of numbers into a different set of numbers. When is a mapping a function?? When every input has a distinct output. Other than a one-to-one function, what’s another type of mapping that is also a function?