Practical on Acoustic Grating (Finding velocity of ultrasonic waves )

Acoustic Grating  (Finding velocity of ultrasonic waves )

1.How to read micrometer screw 

https://drive.google.com/file/d/1FDCgs0tRqSmdVymw5ja6XyEOa9Uet5Er/view?usp=sharing

2.How to perform practical and note down  deflection 

https://drive.google.com/file/d/1ph_JqK949xzosbM-I9nhPbZmWj4HBdu_/view?usp=sharing

3 Calculation regarding  observation 

.https://drive.google.com/file/d/1yxdhtOCsTtk6eh2w-pD61XLgK1GPrKj_/view?usp=sharing