Key Facts Flashcards

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1
Q

What colour is each wire in a plug ?

A

Blue - neutral
Brown- live
Yellow and green - earth

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2
Q

Arrange the colours of visible light so they are ordered by frequency.

A

Red orange yellow green blue indigo violet (Richard of York gave battle in vain)

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3
Q

Which scientist proposed that matter is made of tiny spheres called atoms that :
- cannot be broken up into smaller parts
-cannot be either created or destroyed

A

John dalton

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4
Q

Which part of the earths structure causes its magnetic field and what two materials found there cause this

A

Earths core , iron and nickel

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5
Q

Unit to measure radioactivity (radioactive decay )

A

Becquerels (Bq)
Measures the number of nuclear decays each second

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6
Q

How’s a beta minus particle formed?

A

If a nucleus’s contains too many neutrons , a neutron may split into a proton and a fast moving electron , the electron is a beta minus particle.

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7
Q

Density formula

A

Mass /volume =density

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8
Q

Which type of wave can travel through a vacuum ?

A

Electromagnetic waves don’t need a medium and can travel through a vacuum.

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9
Q

What you use displacement to measure ?

A

Volume

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10
Q

Kinetic energy

A

Ke= 0.5xmassx(speed)squared

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11
Q

When an appliance is running normally what voltage will be running through :
Earth wire
Live wire
Neutral wire

A

230v-live wire
0v-neutral and earth

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12
Q

In this formula to find the acceleration of an object :
Vsquared-usquared =2ax

What does each variable represent ?

A

V= final velocity
U= initial velocity
A= acceleration
X= distance

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13
Q

Which direction does the magnetic field travel ?

A

North Pole -> South Pole

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14
Q

Specific heat capacity

A

The specific heat capacity of a substance is the amount of energy required to raise the temperature of 1kg of the substance by 1degrees C.

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15
Q

Specific latent heat ?

A

Amount of energy needed for a substance to change state of 1kg of the substance with no change in temperature.

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16
Q

When a substance changes state on a graph why does the temperature stop increasing and stay constant? (Graph levels off at these points)

A

Energy being put in is weakening or breaking the forces of attraction between particles (bonds)

17
Q

Specific latent heat of fusion

A

The energy required to change 1kg of a substance from a solid to a liquid with no change in temperature.

18
Q

Specific latent heat of vaporisation

A

The energy required to change 1kg of a substance from a liquid to a gas (vapour) with no change in temperature.

19
Q

E=M x l

A

Specific latent heat formula

Energy= mass x latent heat

20
Q
A

Specific heat capacity formula

Change in energy = mass x specific heat capacity x change in Temperature