| ⇦ | 
| ⇨ |
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: - Temperature is a measurement of coldness or hotness of an object.
- If, an electron in hydrogen atom jumps from an orbit of level n=3 to an orbit
- The ratio of longest wavelength corresponding to Lyman and Blamer series
- If the feedback voltage is increased in a negative feedback amplifier, then
- A charge Q is uniformly distributed over a large plastic plate. The electric field
Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Temperature is a measurement of coldness or hotness of an object.
- If, an electron in hydrogen atom jumps from an orbit of level n=3 to an orbit
- The ratio of longest wavelength corresponding to Lyman and Blamer series
- If the feedback voltage is increased in a negative feedback amplifier, then
- A charge Q is uniformly distributed over a large plastic plate. The electric field
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