Seeing, Hearing, Feeling 19.7 High frequency wave Questions


1. Copy and fill in the blanks: a. Unlike


through a


b. Refraction is the passes from one


light onto the


waves, light can travel . It does not need a


to travel through.


of light as it to another.


c. The lens system of your eye consists of the and the


eye. This sends a message through the to your brain, which


interprets it as an image.


d. The breaking up of white light into its seven colours is known as done using a


. This can be .


e. The primary colours are and


make light.


f. The secondary colours are and


g. Sounds can be created by hear the sounds.


h. Heat transfer by vibration of particles is called


. Heat transfer by the


movement of particles in liquids and gases is called


.


i. Heat transfer in the form of infrared , without the need for a medium, .


is known as


j. In general, substances heated and


when when cooled. Water


is an exception, as it begins to when cooled below 4 °C.


2. Explain why you cannot see an image of yourself in the bricks of the laboratory wall, but you can see a vague image of yourself in the glass of the window.


3. The speed of sound is 340 m/s. A student sees a flash of lightning and then hears the clap of thunder five seconds later. How far away is the lightning storm?


, . Each


one is created from combining two colours.


. This


forms sound waves in the air, which causes our


to vibrate, allowing us to Bunsen burner


a. Will the ice melt when the Bunsen burner is turned on? Explain the reason for your answer.


b. Copy the diagram above and label the different types of heat transfers taking place.


6. Provide a scientific reason for the following: a. Rescue services can use a thermal imaging camera to locate people trapped under the rubble from an earthquake.


b. The heating element of a kettle is at the bottom.


c. A pot of hot water that is about to boil over can be stopped by placing a cold metal spoon into it.


d. The heating wire of a toaster is able to toast bread without touching it.


e. Fish can survive the winter at the bottom of a frozen pond.


7. Describe, with the aid of a labelled diagram, how convection heats the water when a kettle is boiled.


345 Ice cube , . Combined, they Weight Test tube . This focuses at the back of your


Draw diagrams showing what the wave would look like if: a. The frequency was decreased. b. The amplitude was increased.


5. A student set up the following equipment: Water


4. A student generated a sound wave and recorded it with a sound meter app. The following wave form was produced:


High pitch


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