state true or False
1.Mirror is not an reflecting surface..
2.The distance between focus and and pole is called focal length...
3.The speed of sound in air at 22°C is 344 m/s.
4.the frequency of infrasound is below 20HZ
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state true or False
1.Mirror is not an reflecting surface..
2.The distance between focus and and pole is called focal length...
3.The speed of sound in air at 22°C is 344 m/s.
4.the frequency of infrasound is below 20HZ
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this question of answer is 1st true 2nd false 3rd false 4th true
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