Home › Previous year questions › GATE 2026 BM › Question 46GATE 2026 BM – Question 46 Medical Imaging Systems · Ultrasound Imaging · 2 marks · Multiple choice
An ultrasound beam travels 5 cm through material attenuating it by 2 dB/cm. Find exit intensity divided by entry intensity.
0.5 0.9 0.1 0.7 Practise this question in The GATE Grind →
Show answer and explanation Correct answer: (C) 0.1
Explanation The total intensity attenuation is 2×5=10 dB. Using 10 log₁₀(Ientry/Iexit)=10 gives Iexit/Ientry=10⁻¹=0.1. Thus C; the factor twenty would instead apply to an amplitude ratio, not an intensity ratio.
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