Year 10 - Physics - 13-2-15

Thai Sikh International School

E-Learning Programme – Online Assignment 

Name :                                                                                             Subject :Physics 

Year   :  10                                                                                       Schedule No. : 7                        

1.Write short notes on: 1.Echoes,  2. Echo sounder, 3. Electronic tape-measure, and 4. Radar. 

2.Explain diagrammatically the refraction of sound.

3.What are the various factors on which the speed of sound does depend.

4.What is Ultra sound?. Describe its uses.

5.Assume that the speed of sound in air is 330m/s. a). Why do we hear lightning after we see it?., b). If lightning strikes and you hear it 4 seconds after you see it, how far away is it?.