| ⇦ | 
| ⇨ |
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: - Two satellites of earth, S₁ and S₂ are moving in the same orbit. The mass of S₁
- An alpha nucleus of energy 1/2 mv² bombards a heavy nuclear target of charge Ze
- A particle executes simple harmonic oscillations with an amplitude
- The output of an AND gate is connected to both the inputs of a NOR gate,
- Energy of all molecules of a monoatomic gas having a volume V and pressure P is 3PV/2.
Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two satellites of earth, S₁ and S₂ are moving in the same orbit. The mass of S₁
- An alpha nucleus of energy 1/2 mv² bombards a heavy nuclear target of charge Ze
- A particle executes simple harmonic oscillations with an amplitude
- The output of an AND gate is connected to both the inputs of a NOR gate,
- Energy of all molecules of a monoatomic gas having a volume V and pressure P is 3PV/2.
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