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Question 1

Sum to n of arithmetic

Answer 1

1/2n (2a + (n-1)d)

Question 2

Sum to infinity geometric

Answer 2

A/1-r

Question 3

Sum to n of geometric

Answer 3

A(1-r^n)/1-r

Question 4

Teerm for arithmetic

Answer 4

Un = a + n-1 d

Question 5

Term for geometric

Answer 5

= a r^n-1

Question 6

Volume cone

Area!

Answer 6

1/3 h pi r 2

Question 7

Area sphere

Answer 7

4 pi r2

Question 8

Area of a cone

Answer 8

Pi r 2 + pi r l

Question 9

Angle at centre is twice angle at circumference

Question 10

Angles in thr same segment are EQUAL

Question 11

Congruent vs similar?

Answer 11

Similar is when angles same or sides ratio same

Congruent when they are EQUAL ASA SSS ETC

Question 12

How can insulators be charged

Answer 12

By friction, this is he transfer of electrons from the 8nshkator or too it

Question 13

When is a voltage or current induced in magnetism

Answer 13

When a wire cuts magnetic field lines or when mangentic field changes

Question 14

That is thermal radiation

Answer 14

Electromagnetic radiation in infrared region

Question 15

PV = at constant Tempe?

Answer 15

Constant

Question 16

Doppler effect?

Question 17

Convection and conduction

Answer 17

Conduction is a process where transfers of heat takes place between objects by DIRECT CONTACT

CONVECTION is the heat transfer in fluids by real movement kf matter (water or gas)

Question 18

Remember that fir critical angle what must refractive index be

Answer 18

What it’s going into must be bigger than itself

Question 19

What gives loudness and pitch properties in sound

Answer 19

Loudness = amplitude

Pitch = dreaucney

Question 20

Human range of hearing

Answer 20

20 to 20000 he

Question 21

Alpha beta gamma penetration and ionising.

Deflection in magnetic fields

Question 22

FUNDAMENTAL THEOREM OF CALCULUS?

Answer 22

integral of an inverse function is just the normal function values in limits

Or jus integral of a function, find inverse and plug in

Question 23

Combining integral ranges?

Answer 23

Jus bun off common E number top and bottom

Question 24

Elastic collision?

Answer 24

Kinetic energy is conserved

Question 25

Node anti node

Answer 25

Anti is high hide is low

Distance e between two nodes is half orig sk wave,e the

Question 26

Convection

Answer 26

Heat energy transferred from hot to cold by convection as the liquids and gases expand when they are heated , so they take more volume

As a result hit areas less dense

So they rise into cold areas

Denser gas which is colder will thus then fall into warm areas

And convection current set up warming everything