Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
33 Cards in this Set
- Front
- Back
|
What is inferred radiation ? |
A type of energy transferred by electromagnetic waves |
|
|
Can you tell if an object is giving out inferred? Why? |
No, because no visible light radiation is being given off |
|
|
What are differences between all three states of maters |
Solids are tightly packed in neat and organised rows. liquids have no fixed shape but have a fixed volume. Gases are very spread out with no fixed shape as it takes shape of surroundings and no fixed volume. |
|
|
what happens to air when it have more energy |
the particles become spread out and becomes less dense |
|
|
how could you change the rate of evaporation |
increasing the flow of air. Add energy to the liquid. Increase surface area of the liquid |
|
|
what is the equation for the amount of energy needed to heat an object. |
E = M * c * 0- energy mass heat temp transferred capacity change |
|
|
What's redshift? |
The increase of a wavelength from a galaxy moving away.
|
|
|
Define Oscillation
|
Vibration or repetitive pattern of movement, for example, up and down or side to side.
|
|
|
Medium
|
The material through which a wave travels.
|
|
|
Optical fibres
|
A thin glass or plastic strand that can transmit light or infared radiation over long distances.
|
|
|
Describe how cosmic background radiation provides evidence for the big bang theory
|
The Big Bang theory predicts that the radiation released when the universe started to expand is still present. As the universe expanded the wavelength increased so that it is now microwaves. This cosmic microwave background radiation has been observed and is evidence for the Big Bang theory
|
|
|
Alternating current (a.c.)
|
An electric current which changes direction of flow continuously
|
|
|
Direct current (d.c.)
|
An electric current that flows in one direction
|
|
|
Static electricity
|
Electricity caused by rubbing that causes the loss or gain of electrons
|
|
|
Terminal velocity
|
The maximum velocity reached by a falling object (forces are balanced)
|
|
|
What is light apart of?
|
electromagnetic spectrum |
|
|
Which two ionising radiations in the electromagnetic spectrum are high energy ultraviolet?
|
X-rays and gamma rays
|
|
|
How do sunscreens and clothing protect people?
|
By absorbing ultraviolet radiation emitted by the sun.
|
|
|
What's global warming?
|
Things like greenhouse gases slowly increasingthe average temperature worldwide.
|
|
|
What 3 gases in the atmosphere are responsible for the greenhouse gas effect?
|
- Water vapour has the most effect, because there's so much of it.- The small amount of carbon dioxide.- Methane is a strong absorber of infrared radiation, but there is very little of it.
|
|
|
What 3 things provide energy for humans?
|
CarbohydratesFatsProteins
|
|
|
Where is cholesterol found and made?
|
In the blood and in some foodsLiver
|
|
|
What are the 2 main types of pathogens?
|
VirusBacteria
|
|
|
Name 3 bacteria infections
|
Tetanus
Whooping cough Food poisoning Cholera TB |
|
|
Name 3 viruses
|
Mumps
MeaslesRubella Colds Flu Polio |
|
|
State the sequence of the nervous system
|
Receptor
Sensory Neurone Relay Neurone Spinal chord/brain Motor Neurone Effector |
|
|
What are auxins?
|
Hormones that control the way plants respond to light and gravity
|
|
|
What are statins?
|
A drug that lowers cholesterol in the blood which therefore reduces the risk of heart disease
|
|
|
Define:
a). pathogen b). antibiotic |
a). an organism that causes disease
b). a drug that kills bacteria |
|
|
Ignaz Semmelweis
|
Introduced proper hygiene to hospitals e.g.Handwashing
|
|
|
Lamarck's Idea
|
Animals don't go extinct, instead they change by overusing or under using their important features
|
|
|
Darwin's Idea
|
Evolution happens through the process of Natural Selection
|
|
|
Natural Selection
|
There is variation in a species. Some are better adapted than others. Those that live pass on their good genes
|
