62 A 62 B 62 C 63 A 63 B 63 C 64 A 64 B 65 A 65 B 65 C 66 A 66 B 66 C 67 A 67 B 68

Lakhmir Singh & Manjit Kaur - Physics

Very Short Answer Type Questions-Pg-185

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Short Answer Type Questions-Pg-186

41 42 43 A 43 B 44 45 46 47 48 A 48 B 49 50 51 52 53 54 55 56 57 58 59 60 A 60 B 61 A 61 B 62 A 62 B 67 A 67 B

Long Answer Type Questions-Pg-187

63 A 63 B 64 A 64 B 65 A 65 B 66 A 66 B

Multiple Choice Questions (MCQs)-Pg-187

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Questions Based on High Order Thinking Skills (HOTS)-Pg-188

Very Short Answer Type Questions-Pg-206

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Short Answer Type Questions-Pg-207

38 39 40 41 42 43 44 45 46 47 A 47 B 48 A 48 B 49 50 51 52 53 54 55 56 57 58 A 58 B 59 A 59 B 60 61

Long Answer Type Questions-Pg-208

62 A 62 B 62 C 63 A 63 B 63 C 64 A 64 B 65 A 65 B 65 C 66 A 66 B 66 C 67 A 67 B 68

Multiple Choice Questions (MCQs)-Pg-208

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Questions Based on High Order Thinking Skills (HOTS)-Pg-209

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Q. 65 B4.3( 6 Votes )

What are infrason

Class 9th Lakhmir Singh & Manjit Kaur - Physics 5. Sound

Answer :

Sound waves of frequencies greater than 20,000 Hz are called ultrasonic waves. Porpoises and bats produce ultrasonic waves.

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