100 or so IGCSE Physics things to learn Flashcards Preview

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Flashcards in 100 or so IGCSE Physics things to learn Deck (201)
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1

What component is this? 

Variable resistor

2

Electrical hazards include….

Frayed cables, damaged sockets, water near sockets and metal objects in sockets

3

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

4
Give the unit and unit symbol for

Volume, V

metre cubed (m3)

5

The initial linear part of a force-extension graph is linked to what law?

Hooke's Law (Force is directly proportional to extension)

6

What type of radioactive decay is most penetrating?

Gamma

7

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

8

What are the artificial sources of background radiation?

Medical sources, fallout from nuclear weapons testing and use, nuclear accidents

9

Define amplitude

Amplitude is the maximum displacement above the equilibrium

10

What happens to the resistance of a thermistor as it is heated

High temperatures reduces the resistance of a thermistor

11

Comets orbit what? What shapes are their orbits?

Comets orbit stars (e.g. the Sun) in elliptical orbits

12

What are the dangers of ionising radiation?

Mutation and damage to cells and tissues

13

What are the energy transfers involved with solar cells

light ⇒ electrical

14
What equation links;

wave speed, frequency and wave length

wave speed = frequency x wave length

15

Describe the motion of gas particles

gas particles move in a random fast motion

16

What are the energy transfers involved with nuclear power

nuclear ⇒ thermal ⇒ kinetic ⇒ electrical

17

After two half-lives, how much of an original sample is left?

One quarter

18
Give the unit and unit symbol for

Power, P

watt (W)

19

Why is the image in a mirror virtual?

The image in a mirror can't be projected onto a screen

20

The gradient of a velocity-time graph gives

Acceleration

21

What are the energy transfers involved with wind power

kinetic ⇒ electric

22

What makes something an elastic material

Material regains original shape once stretching force is removed

23

What type of radioactive decay is most ionising?

Alpha

24

In what two ways can radioactive decay be detected?

By photographic film and by a Geiger-Müller (GM) Tube

25

How can you prevent heat transfer by radiation?

Shiny surfaces are poor emitters. They also refelect the thermal radiation back.

26

Give an example of an AC source and a DC source

Mains are an AC source. Batteries are DC sources

27

Our local galaxy is called

The Milky Way

28

What isotope Carbon-14 often used for

radiometric dating; identifying how old something is based on the count rate of the carbon-14

29

When a wave is refracted what two things change

Speed and direction change during refraction

30
Give the unit and unit symbol for

Length, l

metre (m)