Physics
The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?

1.0479166666667
0.21041666666667
2.0958333333333
0.12847222222222

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Physics
Holography is a technique of

Recording a permanent three dimensional multicolour photograph
Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional black and white photograph
Recording a permanent three dimensional photograph of a given single colour or a multicolour

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