What component is this?
Electrical hazards include….
Frayed cables, damaged sockets, water near sockets and metal objects in sockets
How many alpha-particles take this path?
What does this show?
Some of the particles take this path.
It shows there is a charged region
metre cubed (m3)
The initial linear part of a force-extension graph is linked to what law?
Hooke's Law (Force is directly proportional to extension)
What type of radioactive decay is most penetrating?
How does a fuse work
When the current goes higher than the value of the fuse it melts. This breaks the circuit and stops current flowing
What are the artificial sources of background radiation?
Medical sources, fallout from nuclear weapons testing and use, nuclear accidents
Amplitude is the maximum displacement above the equilibrium
What happens to the resistance of a thermistor as it is heated
High temperatures reduces the resistance of a thermistor
Comets orbit what? What shapes are their orbits?
Comets orbit stars (e.g. the Sun) in elliptical orbits
What are the dangers of ionising radiation?
Mutation and damage to cells and tissues
What are the energy transfers involved with solar cells
light ⇒ electrical
wave speed, frequency and wave length
wave speed = frequency x wave length
Describe the motion of gas particles
gas particles move in a random fast motion
What are the energy transfers involved with nuclear power
nuclear ⇒ thermal ⇒ kinetic ⇒ electrical
After two half-lives, how much of an original sample is left?
Why is the image in a mirror virtual?
The image in a mirror can't be projected onto a screen
The gradient of a velocity-time graph gives
What are the energy transfers involved with wind power
kinetic ⇒ electric
What makes something an elastic material
Material regains original shape once stretching force is removed
What type of radioactive decay is most ionising?
In what two ways can radioactive decay be detected?
By photographic film and by a Geiger-Müller (GM) Tube
How can you prevent heat transfer by radiation?
Shiny surfaces are poor emitters. They also refelect the thermal radiation back.
Give an example of an AC source and a DC source
Mains are an AC source. Batteries are DC sources
Our local galaxy is called
The Milky Way
What isotope Carbon-14 often used for
radiometric dating; identifying how old something is based on the count rate of the carbon-14
When a wave is refracted what two things change
Speed and direction change during refraction