Understanding Light and Sound Concepts
Explore the fundamentals of light and sound in this educational content, covering topics such as luminous objects, transparent and translucent materials, shadow formation, noise pollution, and ways to reduce it. Learn about the production of sound, the nature of shadows, and the distinction between transparent and translucent objects. Enhance your knowledge with definitions and question-and-answer sections, making the concepts clear and understandable.
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Presentation Transcript
CH-9 Light and Sound
Fill in the blanks- a) Objects such as bed and bag that do not emit light are called non- luminious object. b) Translucent objects allow some light to pass through them. c) Transparent objects allow light to pass through them completely. d) Light travels in a straight line.
True/False a) A shadow may differ in size and shape. (T) b) Soft and pleasant sounds are called noise.(F) c) Opaque object allow light to pass through them.(F) d) Shadow formed by the sun are longest during afternoon.(F)
Define the following a) Cling film- A thin transparent plastic film usually used for wrapping food. b) Luminous object- Objects that emit light are known as luminous object. c) Noise Pollution- Loud and unpleasant sounds hurt our ears. These unpleasant and harmful noises result pollution.
Question/Answer Q1- How is sound produced? Ans- Sound is produced by an vibrating object. Vibrations are produced when we speak, laugh and clap. Q2-What is shadow? Ans- When an object blocks light, a dark shape is formed . This dark shape is called shadow.
Q3-Write any two ways to reduce noise pollution. Ans- (i) Do not play loud music. (ii) Do not set off loud firecrackers. Q4- Difference between transparent and translucent object- Transparent object Translucent object a) It allows light to pass through them completely. b) E.g- cling film, clear glass. a) It allows some light to pass through them. b) E.g- dirty water, coloured glass .
