Physics

Question 1

Describe a longitudinal wave and tranverse wave and how they differ

Answer 1

Transverse: occilate up and down, at right angles to the direction of energy transfer
Longitudinal: ocilate by a series of comression and rarefractions that transfers energy parrallel with the direction

Question 2

Draw a labelled diagram of a wave

Answer 2

need to include:
-amplitude
-wavefront
-wavelength

Question 3

How do transverse and longitudinal waves differ in vacuums

Answer 3

transverse: Can (electromagnetic waves
longitudinal: cannot

Question 4

How do transverse and longitudinal waves differ in vacuums

Answer 4

transverse: Can (electromagnetic waves
longitudinal: cannot

Question 5

How do transverse and longitudinal waves differ travelling in different materials

Answer 5

Transverse: can travel through solids, and on surface of liquids
Longitudinal: can travel through all matter

Question 6

Define frequency

Answer 6

number of waves passing a certain point per second

Question 7

define time period

Answer 7

Amount of time taken for a single wave to pass a point

Question 8

wave transfer _________ without transferring _______

Answer 8

energy and info
matter

Question 9

wave speed =

Answer 9

frequency x wavelength

v = f x λ

Question 10

Whats the frequency range for human hearing

Answer 10

20Hz - 20,000Hz

Question 11

How do you measure the speed of sound in air?

Answer 11

Clap-echo method.
measure the time taken for you to hear an echo from a sharp clap, either made by hands or by banging two wooden blocks together.
You stand a long distance from someone, they clap, and listen for the echo
(time jhow long it takes and then do the equation)
—>speed=distance/time

Question 12

How are pitch and volume worked out when looking at a wave graph

Answer 12

pitch - frequency
volume - amplitude

Question 13

What is current

Answer 13

the rate of flow of charge

Question 14

What does charge equal

Answer 14

charge = current x time

Question 15

How does electrical current flow in solid metal conductors

Answer 15

Its the flow of negitively charged electrons, and is a conductor because the electons are free to move between atoms

Question 16

Give 5 examples of electrical conductors:

Answer 16

Copper, Brass, Steel, Gold, and Aluminium
—>these are used in wires
(mercury is a very good liquid conductor)

Question 17

Give 5 examples of electrical insulators:

Answer 17

Plastic, wood, glass and rubber
—>used to cover electrical conductors

Question 18

Give 5 examples of electrical insulators:

Answer 18

Plastic, wood, glass and rubber
—>used to cover electrical conductors

Question 19

Describe the investigation that tests the transfer of electrical charges on insulaters and what the observations will be

Answer 19

Take a polythene rod, hold it at its centre and rub both ends with a cloth and suspend the rod, without touching the ends
Take an acrylic rod and rub it with another cloth
Bring each end of the acrylic rod up to, but without touching, each end of the polythene rod
Record any observations of the polythene rod’s motion, repeat, changing out the acrylic rod for rods of different materials

When two insulating materials are rubbed together, electrons will transfer from one insulator onto the other insulator
—>A polythene rod is given a negative charge by rubbing it with the cloth
—>This is because electrons are transferred to the polythene from the cloth and electrons are negatively charged, hence the polythene rod becomes negatively charged

Conversely, an acetate rod is given a positive when rubbed with a cloth
—>This is because electrons are transferred away from the acetate to the cloth, so loses negative charge and becomes positive

Question 20

Like charges ______
Oppossite charges ______

Answer 20

repel
attract

Question 21

Like charges ______
Oppossite charges ______

Answer 21

repel
attract

Question 22

What are the dangers of electrostatic

Answer 22

Sparks