(1) A thin metal wire , AB, is tied at the points A and B such that it is stiff. It is plucked one quarter way from one end. a) Name the energy changes which take place if the wire is plucked with the finger or a small piece of broom. b) Sketch a diagram to show the appearance of the plucked wire, and indicate the distance that represents one wavelength. (2) Explain how a bimetallic strip works in an electric iron to switch it on and off. (3) Explain why a metal spoon, left beside a flame for a few minutes becomes so hot to touch.
(1) A thin metal wire , AB, is tied at the points A and B such that it is stiff. It is plucked one quarter way from one end. a) Name the energy changes which take place if the wire is plucked with the finger or a small piece of broom. b) Sketch a diagram to show the appearance of the plucked wire, and indicate the distance that represents one wavelength. (2) Explain how a bimetallic strip works in an electric iron to switch it on and off. (3) Explain why a metal spoon, left beside a flame for a few minutes becomes so hot to touch.
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(1) A thin metal wire , AB, is tied at the points A and B such that it is stiff. It is plucked one quarter way from one end.
a) Name the energy changes which take place if the wire is plucked with the finger or a small piece of broom.
b) Sketch a diagram to show the appearance of the plucked wire, and indicate the distance that represents one wavelength.
(2) Explain how a bimetallic strip works in an electric iron to switch it on and off.
(3) Explain why a metal spoon, left beside a flame for a few minutes becomes so hot to touch.
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