| ⇦ | 
| ⇨ |
A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of
Options
(a) 100
(b) 1000
(c) 10000
(d) 10
Correct Answer:
100
Explanation:
L₁ = 10 log (I₁ / I₀) ; L₂ = 10 log (I₂ / I₀)
L₁ – L₂ = 10 log (I₁ / I₀) – 10 log (I₂ / I₀)
Δ L = 10 log (I₁ / I₂)
20 dB = 10 log (I₁ / I₂)
10 ² = (I₁ / I₂)
I₂ = I₁ / 100.
Related Questions: - A coil of N turns and mean cross-sectional area A is rotating with uniform angular
- In a thermodynamic system, working substance is ideal gas. Its internal energy
- A uniform force of (3i+j) Nacts on a particle of mass 2 kg.Hence the particle is displaced
- Consider 3rd orbit of He⁺(helium), using non-relativistic approach, the speed
- The electric potential at a point (x,y,z) is given by V = – x²y – xz³ + 4.
Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A coil of N turns and mean cross-sectional area A is rotating with uniform angular
- In a thermodynamic system, working substance is ideal gas. Its internal energy
- A uniform force of (3i+j) Nacts on a particle of mass 2 kg.Hence the particle is displaced
- Consider 3rd orbit of He⁺(helium), using non-relativistic approach, the speed
- The electric potential at a point (x,y,z) is given by V = – x²y – xz³ + 4.
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply