@?physics

See Also [[Physics - Reflection and Refraction]]S [[Physics - Waves]]S [[Physics - Diffraction]]S [[Physics - Intensity]]S Flashcards What is polarisation?? Where particles in a wave are oscillating in one direction only. What does it mean for a wave to be plane polarised?? Where the particles in the wave are oscillating along a single plane. What does it mean for a wave to be partially polarised?? Where most of the particles in a wave are oscillating along a single plane.

See Also [[Physics - Reflection and Refraction]]S Flashcards 2021-03-11 What is diffraction?? The spreading out waves as it passes through an opening or apeture. Why doesn’t shining a torch through a door frame cause diffraction?? Because the width of the door frame is very different from the wavelength. When does diffraction occur?? When the width of the opening is roughly the same as the wavelength. Why do radio waves travel further than micro waves?

What is missing?? What is missing?? What is missing?? What is missing?? What is missing?? What is the Law of Reflection?? On a smooth plane, the angle of incidence is equal to the angle of reflection. What is missing?? What is missing?? What is missing?? What is missing?? What is missing?? Why does refraction occur?? Because the wave changes speed when it passes from medium to another. What is partial reflection?? A slight reflection off a surface that a wave is refracted through.

What are the axis on an oscilliscope?? Voltage-time What does the horizontal space between two points represent on an oscilliscope?? The period. Backlinks [[Physics - Syllabus]]S Metadata date: 2021-02-25 10:25 tags: - '@?school' - '@?physics' - '@?waves' - '@?year-1' - '@?school' - '@?public' title: Physics - Oscilliscopes

What type of conductor are thermistors?? Semiconductors. What type of conductor are LDRs?? Semiconductors. How do thermistors and LDRs work?? They have a number densitry that changes in response to environmental effects. What does the resistance-temperature graph look like for a typical thermistor?? For a typical thermistor, what does a low temperature mean?? A high resistance. What does NTC stand for?? Negative Temperature Coffecient. What does a Negative Temperature Coefficient mean?? A low temperature will have a high resistance.

Flashcards What is the symbol for wavelength?? $$ \lambda $$ What is the symbol for the period of oscillation in a wave?? $$ T $$ What is the symbol for wave speed?? $$ v $$ What is the frequnecy of a wave?? The number of wavelengths passing through a given point per unit time. What is the period of oscillation of a wave?? The time taken for a wave to move one whole wavelength past a given point.

What three things does the resistivity depend on?? The material of the wire. The length of the wire. The cross-sectional area of the wire. If you double the length of a wire, what happens to the resistance?? It also doubles. What’s the difference between resistivity and resitance?? Resistivity is the property of a material whereas resistance is just a measurement of a component. How would you write that the resistance $R$ is directly proportional to its length $L$?

What is Ohm’s Law?? The current through an ohmic conductor is proportional to the potential difference across it when at a constant temperature. What is the symbol formula for resistance?? $$ R = \frac{V}{I} $$ What is the word formula for resistance?? $$ \text{resistance} = \frac{potential difference}{current} $$ What is the formula for potential difference $V$ in terms of resistance $R$ and current $I$?? $$ V = IR $$ What is the formula for current $I$ in terms of resistance $R$ and potential difference $V$?

2021-01-18 What does “potential energy” mean?? The potential to do work. How does a stretched elastic band have the potential to do work?? When it is released it will move. What is potential difference?? The energy transfered per unit charge from electrical energy to another form of energy. When used to measure a component, what does potential difference measure?? The difference in energy in the charge carriers before and after going through the component. What does EMF stand for?

What is the formula for the vertical component of a momentum $p$?? $$ p\sin\theta $$ What is the formula for the horizontal component of a momentum $p$?? $$ p\cos\theta $$ If an object with mass $m_1$ is travelling in a straight line with velocity $v_1$, what is its momentum?? $$ m_1v_1 $$ If an object with mass $m_1$ is travelling at an angle $\theta_1$ to the $x$ direction with velocity $v_2$, what is its momentum?? $$ m_1v_1\cos\theta_1 $$

Questions for Teacher If there’s no potential difference in a wire, what happens to the electrons?? They will drift randomly. What happens to the randomly drifting electrons in a wire when a potential difference is applied?? They start to drift in the same direction. What is meant by electron drift velocity?? The average displacement of the electrons along the a wire per second. Why do electrons move slowly through a metal?? Because the electrons are colliding with the lattice of atoms.

What is the symbol for a wire in a circuit?? What is the symbol for a resistor in a circuit?? What is the symbol for a light bulb in a circuit?? What is the symbol for a cell in a circuit?? What is the symbol for a battery in a circuit?? What is the symbol for a switch in a circuit?? Which is the positive terminal?? The one on the left. What is the technique for remembering the positive and negative terminals on a cell?