Seeing colour OALH

Do now

1

Name the EM wave with the shortest wavelength.

1

In the diagram, I can tell that the light is moving into a (more/less) dense medium, due to the fact that it moves (away from/towards) the normal.

1

State the formula for calculating wave speed.

1

Name the main store of energy in a moving object

1

A tennis ball contains 250J of energy stored kinetically. On contact with the ground, 200J is transferred to the elastic store. Calculate the amount of energy lost as heat:

1

Challenge: Calculate the frequency of a wave which is travelling at 12m/s with 1.5m between each crest.

New learning - checking for understanding

1

Which colour light is this object absorbing...

1

Which colour light is this object reflecting:

1

Which colour light is this object reflecting:

1

Which colour light is this object absorbing

LCWC - Knowledge checker

1

State the colours in visible light

1

What does a filter do?

1

Why do objects appear to be white?

1

Why do objects appear to be black?

LCWC - No peeking

1

State the colours in visible light

1

What does a filter do?

1

Why do objects appear to be white?

1

Why do objects appear to be black?

Recall quiz

1

A.Why does the shirt look blue?

1

Why do the shorts look white?

1

Why do his shoes look black?

You do task

1

Explain why we see each of the following colours through the filters, in each example.

Plenary

1

A light ray is reflected. The angle of incidence is 45°, what is the angle of reflection?

1

What are the three other things that can happen to light waves when interacting with an object, apart from reflection?

1

What do we call it when light changes speed and direction when moving from one medium to another?

1

Name the EM wave with the shortest wavelength.

In the diagram, I can tell that the light is moving into a (more/less) dense medium, due to the fact that it moves (away from/towards) the normal.

State the formula for calculating wave speed.

Name the main store of energy in a moving object

A tennis ball contains 250J of energy stored kinetically. On contact with the ground, 200J is transferred to the elastic store. Calculate the amount of energy lost as heat:

Challenge: Calculate the frequency of a wave which is travelling at 12m/s with 1.5m between each crest.

Which colour light is this object absorbing...

Which colour light is this object reflecting:

Which colour light is this object reflecting:

Which colour light is this object absorbing

State the colours in visible light

What does a filter do?

Why do objects appear to be white?

Why do objects appear to be black?

State the colours in visible light

What does a filter do?

Why do objects appear to be white?

Why do objects appear to be black?

A.Why does the shirt look blue?

Why do the shorts look white?

Why do his shoes look black?

Explain why we see each of the following colours through the filters, in each example.

A light ray is reflected. The angle of incidence is 45°, what is the angle of reflection?

What are the three other things that can happen to light waves when interacting with an object, apart from reflection?

What do we call it when light changes speed and direction when moving from one medium to another?

Explain why an object appears black?