extra Flashcards
Don’t sa pay average.
say Repeat to Improve reliability.
dont say proportional say
pos correlation
How could a meteor colliding with the earth cause an earthquake
kinetic energy of meteor may cause earthquake, earthquakes happen where plates slide past,over,under away from eachother and the plates move suddenly. Meteor collsision causes seismic waves.
How do ultrasound waves detect fis
Ultrasound waves go donw through the water abd are reflected off the fish where they are recieved by the boat, time delay shows how deep they are
What are the advantages of using an xray machine?
oes not cause damage to healthy cells and is very portable, 3d image possible and uses non-ionising radiation. More suitable for bony structures.
How is a reflecting telescope different from the simple telescope which Galileo used?
Reflecting telescopes have mirrors whereas Galilean telescopes only have lenses. Reflecting telescope can gather more light and can have a larger objective. Image is viewed from the side of reflecting telescopes but it is viewed for the end of galilean telescopes.
How do optical fibres work.
Optical fibres bend, some carry light to the inside of the patient and some fibres transmit reflected lighr. Light passes up and down fibres by TIR and light is reflected inside the patient. This image is then analysed by a computer.
How is ultrasound used as a medical treatment for illness or injury.
Breaks/smashed/ Kidney stones and use of gel to prevent loss of intensity. Prenatal scan.
What happens to the wavelength of light when it passes from air into glass?
The wavelength decreases because the wavelength is the ratio of wave velocity to frequency and the wave velocity reduces but the frequency stays the same.
5
How does a reflecting telescope form an image of a distant object?
Uses a mirror which is concave.
What does the eyepiece of the telescope do?
It magnifies it.
What is the evidence for the geocentric model?
Idea of sun, moon, stars or planets moving across the sky in the same direcxtion. The pattern is repeated and appear to be going round earth every day.
What is the evidence against the geocentric model?
Moons of Jupiter orbit Jupiter, movement of sun is not the same each day. Planets do not move in a simple path and the move west to east.
What ultrasound would be the best to scan organs?
One with a higher intesnsity and less energy absrobed so it penetrates deepest.
What can UV cause?
Penetrating the skin causing skin cancer and mutating cells. Penetrates the eye and can damage cells in the eye causing cataracts.
What are some uses of fluoresence?
Used on items to assist in identification if stolen. Write a secret message on paper. On currency to identify forgery. Stamps on back of hand for an event.
xray.
At the airpot to check for illegal items. Checking welds or to examine under the surface. Sterilising food and hospital equipment.
What is chemical energy?
The energy stored by the chemical bonds between atoms.
Nuclear energy.
Energy stored in nucleus of atom. Released through radioactive decay.
What does temperature increase?
The energy in the kinetic store.
What properties of radioactive material would be good for treating cancers?
Emits alpha radiation as it is highly ionising and willl destroy the tumours. Alpha particles do not penetratr very far in the body/inserted close to the cancer. A long enough half life for the treatment to take aeffect but a short enough one that the pellets do not need to be removed.
Why do CT scans give a much higher dose of radiation that x rays?
CT scans last much longer and x rays are short exposure. Intesity of CT is higher and many 3d images.
UV
Damage eyes and cause skin cancer.
Water.
When ice melts there is a larger area of water so the temp rises and gets hotter as water reflects less than ice as it has more surface area.
