EOY YR 7 FLASHCARDS

Question 1

what way do the particles in a transverse wave move?

Answer 1

in a TRANSVERSE WAVE, the particles go up and down as the energy moves forward. (Perpendicular
Eg. A water water wave

Question 2

what way do the particles in longitudinal wave move?

Answer 2

In a LONGITUDINAL WAVE, the particles go back and forth as the energy moves forward.
Eg. A sound wave.

Question 3

How is sound produced?

Answer 3

Sound is produced when particles in an object vibrate and the energy transfer to nearby particles coursing a longitudinal wave.

Question 4

what does sound ussually travel through?

Answer 4

Normally these vibrations move subsequent particles in the air, but sound waves can also travel through a solid or liquid.

Question 5

what is the medium?

Answer 5

The substance carrying the wave is known as the MEDIUM.

Question 6

what can sound not travel through?

Answer 6

a vacuum where there are there are no particles, sound cannot travel at all.

Question 7

speed of sound in air

Answer 7

300 m/s (metres per second).

Question 8

speed of sound in water

Answer 8

The speed of sound in water is much faster at about 1470 m/s

Question 9

why is the speed of sound in water quicker to in air

Answer 9

because there are more particles

Question 10

light is what kind of wave

Answer 10

transverse

Question 11

why is light special

Answer 11

it is special as it does not need a medium to travel through.

Question 12

what is a vacuum

Answer 12

something with no particles

Question 13

what is the speed of light in a vacuum

Answer 13

The speed of light in a vacuum is about 300milllion metres per second!

Question 14

How does light travel?

Answer 14

IN a straight line

Question 15

What does the light do

Answer 15

The light from the source hits the object, bounces off it (REFLECTS) and goes into your eye:

Question 16

Law of reflection

Answer 16

The law of reflection states that “the angle of incidence equals the angle of reflection”

Question 17

SOLIDS

Answer 17

Particles are close together and regularly arranged
They are held together with STRONG forces of attraction, and vibrate around fixed points.

Question 18

LIQUIDS

Answer 18

Particles are close together, and arranged randomly
They are held together, but with much weaker forces, meaning they flow past each other through the container.

Question 19

GASES

Answer 19

Particles are far apart, and arranged randomly
The attractive forces between them are VERY weak. The particles move quickly throughout the container.

Question 20

ELEMENTS

Answer 20

are the different types of atoms that exist.

Question 21

COMPOUND:

Answer 21

two or more different types of atom joined by chemical bonds. They are almost impossible to separate.

Question 22

MIXTURE:

Answer 22

two or more different types of atoms or compounds that are NOT joined by chemical bonds. They are easily to physically separate.