| ⇦ | 
| ⇨ |
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: - Alternating current is transmitted to distant places at
- A very small circular loop of radius a is initially (at t=0) coplanar and concentric
- The displacement of a particle along the x-axis is given by x = a sin² ?t
- A leaf which contains only green pigments is illuminated by a laser light
- If energy(E), velocity(V) and time(T) are chosen as fundamental quantities,
Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Alternating current is transmitted to distant places at
- A very small circular loop of radius a is initially (at t=0) coplanar and concentric
- The displacement of a particle along the x-axis is given by x = a sin² ?t
- A leaf which contains only green pigments is illuminated by a laser light
- If energy(E), velocity(V) and time(T) are chosen as fundamental quantities,
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