Question: the question What is the difference in dBs, between a signal at 100% screen height and 6. one at 25% screen height on the screen?

the question

What is the difference in dBs, between a signal at 100% screen height and 6. one at 25% screen height on the screen? a. 20dB b. 14dB C . 12dB 2! 6dB 7. What would be the ratio of signal heights of two signals with a difference of 14 dB between them? a. 14:1 b. 10:1 C. 5:1 d. 2:1 8 . The piezo electric effect can perform which one of the following? Convert electrical energy into mechanical energy Convert electrical energy into signals Convert sound to mechanical energy All of the above 9. Crystals used in ultrasonic testing, which produce the correct mode of vibration, are... a . X-cut b . Y-cut C . Square d. Round 10. Which of the following formulae determines the fundamental frequency of a piezo electric crystal? a. Ff = 2V b. F = A X V C. Ff = V 2t d. F = txV 11. Which piezo electric crystal is the best transmitter of ultrasound? a. Quartz b. Lithium sulphate C. Lead zirconate titanate Barium titanate

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