GATE IN · 2021 · IN
Question 34: Sensors and Industrial Instrumentation
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Question 34
INMCQ2 marksNeeds review
A laser pulse is sent from ground level to the bottom of a concrete water tank at normal incidence. The tank is filled with water up to 2 m below the ground level. The reflected pulse from the bottom of the tank travels back and hits the detector. The round-trip time elapsed between sending the laser pulse, the pulse hitting the bottom of the tank, reflecting back and sensed by the detector is 100 ns. The depth of the tank from ground level marked as x in metre is _____.
(Refractive index of water
and velocity of light in air
m/s)
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2021IN
GATE IN 2021 · Paper 1
Instrumentation Engineering · Original paper archive
- Section
- Instrumentation Engineering
- Question type
- Multiple choice (MCQ)
- Marks
- 2 marks
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