| ⇦ | 
| ⇨ |
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 dust packet is dropped from 5th storey of a multi-storeyed building
- The equation of state for 5 g of oxygen at a pressure P and temperature T,
- A bar magnet of moment of inertia I is vibrated in a magnetic field of induction
- A rod of weight W is supported by two parallel knife edges A and B is in equilibrium
- A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω
Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A dust packet is dropped from 5th storey of a multi-storeyed building
- The equation of state for 5 g of oxygen at a pressure P and temperature T,
- A bar magnet of moment of inertia I is vibrated in a magnetic field of induction
- A rod of weight W is supported by two parallel knife edges A and B is in equilibrium
- A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω
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