phyics
🇬🇧
In English
In English
Practice Known Questions
Stay up to date with your due questions
Complete 5 questions to enable practice
Exams
Exam: Test your skills
Test your skills in exam mode
Learn New Questions
Popular in this course
Learn with flashcards
Manual Mode [BETA]
Select your own question and answer types
Other available modes
Complete the sentence
Listening & SpellingSpelling: Type what you hear
multiple choiceMultiple choice mode
SpeakingAnswer with voice
Speaking & ListeningPractice pronunciation
TypingTyping only mode
phyics - Leaderboard
You may also like
You may also like:
phyics - Details
Levels:
Questions:
175 questions
| 🇬🇧 | 🇬🇧 |
| NA | NA |
| What are transverse waves | Vibrations that occur perpendicular to the direction in which the wave is travelling |
| What are longitudinal waves | Vibrations that occur parralel to the direction in which the wave is travelling |
| Examples of tranverse waves | UV, light, water, x rays |
| Examples of longitudinal waves | Sound waves |
| What are longitudinal waves made up of | Compressions and rarefractions |
| How do you find wave speed | Wave speed (m/s) = frequence (HZ) x wavelength (m) |
| How do you find frequency | 1 / time period |
| What is refraction | Where a wave changes direction when it enters a new medium due to a change in its speed |
| How do water waves in deep water travel | Travel fast, widely spread |
| How do water waves in shallow water travel | Travel slow, closer together |
| What is defraction | Wave spread out when they pass through a gap |
| What happens when the wave passes through the gap | Gap size = wavelength |
| What happens when the wave passes through the gap | Wider gaps = less diffraction |
| What are good conductors and why | Metals, becuase of delocalised electrons |
| What is the process of conduction | When heat is applied, the positive metal ions start vibrating and gain kinetic energy, transfered to cool parts of metal by the delocalised electrons |
| What are insulators | Poor conductors - plastic, wood (because no delocalised electrons), air (extermely far particles) |
| When is convection happens | Liquids and gases |
| What is process of convections | For example, a radiator will heat up the air above the radiator to gain kinetic energy, air expands so the particles occupy more space so the particles become less dense so they rise, where they become cooler so they sink and goes back to radiator, cools down. |
| Where can radiation travel | Solids, liquids and gases |
| What is hooks law | Where the amount of force exterted onto to the string is directly proportianl to the extension |
| What is the correlation between extension and spring constant | Smallest extension = largest spring constant (extension is inversely proportianal to spring constant) |
| NA | NA |
| How do you find force | Mass x acceleration |
| Effects of friction | Restrict movement of the 2 surfaces past each other |
| Effects of friction | Restrict movement of the 2 surfaces past each other |
| NA | NA |
| Affects of force | Speed, direction and shape |
| What is reaction force | Object in on the ground and experience a force that is perpiniduclar to the surface. |
| What is friction | Objects slide over eachother and experience a force |
| Air resistance | Objects moving through the air, air particles collidng with object slowing it down, faster object is travelling, more particles hit it per second so air resistance increases. |
| Magnetic force | Force experienced by any magentic material inside a magnetic feild |
| Electrostatic forces | Force expericne by any charged particles which is held within an electric feild |
| Gravitational force | Force experinced by any mass that is found in a gravitational feild |
| Nucleur force | Strong attractive force between protons and neutrons in the nucleus |
| Tires in a car, what force is it | Friction between car wheels and road |
| How do you find force | Mass(kg) x acceleration(m/s^2) |
| Effects of friction | Generates heat if surfaces are moving, |
| Effects of friction | Restrict movement of the 2 surfaces past each other |
| Effects of image in mirror | Same size, same colour but is inverted, and it is virutal |
| Refractive index formula | Sin i (incident)/ sin r(refraction) |
| If incident angle is the less than the criticle angle.... | We get reflection and refraction |
| If incident angle is the same as the criticle angle.. | Refraction along the boundary occurs |
| If incident angle is greater than the critical angle | Total internal reflection occurs |
| How do optical fibres work | Core of fibre made of glass with high refractive index, cladding is made out of glass with lower refractive index, light entering core is at an angle greatre than the critical angle |
| Examples of the use of optical fibres | Communication, endoscope. |
| What are convex (converging lens) | Makes parralel rays coverage to a principle focus |
| What are concave (diverging) lens | Makes parallel rays diverge (spread out) used in glasses to correct short sightedness |
| What is the focal length | The distance between the centre of the lens and its point of focus |
| What is the principle focus | The point where parallel rays meet after they pass through a lens |
| Real image | An image that can be formed on a screen |
| Virtual image | An image that can't be formed on a screen |
| If an image is formed after the lens.. | It is real |
| If an image is formed before the lens..... | Its is virtual |
| Wavelength of waves in terms of longest to smallest | (rozentruiek, mcgreggor, include violent undeniable x gamesmode) radiowave, microwave, infrared waves, visible, UV, x ray, gamma |
| Highest frequency waves | Gamma and x rays (higher freq than visible light) |
| Uses radio and microwaves | Communication and cooking |
| Infrared uses | Communication (remote controls) |
| Visible light uses | Optical fibres, photography |
| UV uses | Tanning beds, |
| X rays uses | Medicine, images of human body |
| Gamma ray uses | Kill cancer cells, sterilise equipment in medicine. |
| Dangers of ultravoilet | Skin cancer |
| What type of waves are these | Transverse waves |
| Explain why alpha particles and beta particles have different penetrating powers. | Alpha particles have heavy mass and higher charge, means they cause more ionisation, energy lost from ionisation means alpha cant pentrate as far, also the alpha particles are more likely to collide with atoms as they are bigger |
| What is ionising radiation | Random process, either alpha, beta or gamma is given off |
| What happens in alpha decay | 2 neutrons and 2 proteons are emitted |
| What happens in alpha decay | Decreases by 4 |
| What happens in alpha decay | Decreases by 2 |
| What happens in beta decay | Neutrons turn into protons and stays in the nucleus, an electron is emmited |
| What happens in beta decay | Unchanged |
| What happens in beta decay | Proton number increases by 1 |
| What is alpha stopped by | Air, range of 5 - 10cm |
| What is beta stopped by | Alluminium foil, range of metres |
| What is gamma stopped by | Several cm of lead or several m of concrete, infitnte range in air |
| When is gamma emmited | After the emission of alpha and beta |
| Nature of radioactive emission | Happens randomly, cant predict decay or direction, unaffected by temprature change |
| Explain why alpha particles and beta particles have different penetrating powers. | Alpha particles have heavy mass and higher charge, means they cause more ionisation, energy lost from ionisation means alpha cant pentrate as far, also the alpha particles are more likely to collide with atoms as they are bigger |
| What is background radiation | Radiation which is always present in our surroundings, e.g. space, granite rocks, x rays |
| What is half lfie | Time taken for half the radioactive nuclei to decay, its a random process |
| What is pressure in a contaniner caused by | Collision of gas particles with walls |
| What does this pressure do | It creates a small force, which is a pressure |
| What movement do the particles have in the container | Random movement |
| Why does increase temprature increase pressure | Particles gain more kinetic energy, collisions happen more often with greater force |
| What is a echo | Reflected sound waves |
| What is ultrasound | Above 20k hz |
| What is infrasound | Below 20hz |
| Why cant sound travel through a vacuum | Sound requires a medium to be transmitted |
| What are the magnetic materials | Iron, steel, cobalt and nickel |
| What is a hard magnetic material | Material that maintains its magnetism e.g. steel |
| What is a soft magnetic material | Material that lose their magnetism easily e.g. iron |