4.2 Check Your Understanding pg 151 # 8-13

(b) A micrometre (µm) is one millionth of a metre. State the wavelength of the wave (i) in micrometres (ii) in millimetres (iii) in metres

(i) - (ii) - (iii) -

13. Suppose that a device is built that converts colour into sound. For example, if this device detects the colour yellow, it will produce the tone equivalent to middle C on the piano. If it detects blue, then it will produce the same tone one octave higher in pitch (C above middle C). How will the sound for red light compare with the two tones mentioned above?

.

How will green, orange, and violet compare?

.

Explain how a shirt can look green even though the light falling on it contains red, blue, and green.

A shirt can look green even though the light falling on it contains red, blue and green because it absorbs the colour except green, but reflects off green making it look green.

A certain electromagnetic wave has a wavelength of 200 nm. Is this wave visible to humans? Explain your answer.

No, the wave length of 200 nm iss not visible because the wavelength is too short.

A light beam that is composed of red and green light is passed through a red coloured filter. (a) What is the colour of light that passes through the filter?

Red is the colour that passes through the filter.

(b) What colour is absorbed by the filter?

The colour that is being absorbed by the filter is green.

Describe a way to use two prisms to remove the colour yellow from a beam of sunlight.

You use the first prism to eliminate the yellow by merely blocking it from entering the second prism. Use a thin piece of card board just wide enough to fit between the orange and green light (blocking the yellow). Then you use the second prism to break up the yellow beam from the fist prism.