Page 34 - Science and Technology Std 3

FOR ONLINE USE ONLY
DO NOT DUPLICATE

FOR ONLINE USE ONLY

(c) A torch

Figure 7 Sources of light energy

The pictures in Figure 6 show some sources of light. There
are two main sources of light, namely natural and artificial

sources. The sun is the main natural source of light. Artificial
sources of light include candles, kerosine lamps and torches.

Characteristics of light energy

Activity 8 To investigate how light travels in the air

Procedure
(i) Stand outside early in the morning when the sun rises.

(ii) What do you see?
(iii) Write down what you see.

When the sun rises in the morning, you see light rays. These rays

travel in straight lines. Light is a form of energy. This energy
helps us to see. Sunlight is also important for the growth of
plants.

27

PROPERTY OF UNITED REPUBLIC OF TANZANIA GOVERNMENT
Ministry of Education, Science and Technology
Science and Technology 3.indd 27 03/08/2019 11:01