LIGHT & HEAT Review activities: RIGHT ANSWERS

LIGHT & HEAT: REVIEW (76-77)

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Activity 11
• light: mirror, opaque, transparent• light and heat: lightning, fire• sunlight; heat: evaporation, thermal, insulator

Activity 22a. wool; b. batteries; c. heat; d. expansion; e. artificial; f. speed; g. prism; h. temperature

Activity 44Natural light: stars, fire, sunlight, firefly, volcano
Artificial light: candle, torch, matches

Activity 5
a. false: nothing travels faster than light. b. true; c. false: we can see clearly through transparent materials. d. true; e. false: they absorb all colours of light. f. false: it reflects.

Activity 6

1. The mirror reflects the images of vehicles that are coming.
2. b. The water in the glass is refracting light, which makes the straws look bigger.

Activity 7 7
They all have lenses, which make objects look larger or smaller. A camera takes pictures. A telescope lets us see the stars. Microscopes are useful for biologists. Binoculars are good for outdoor activities, like watching birds.

 

Activity 88a. transparent: glass, water, some plastics; b. translucent: some glass and plastics; c.
wood, metal; d. steel and copper; e. cotton and wool

Activity 99• a. 6; b. 3; c. 1; d. 2; e. 5; f. 4