| ⇦ | 
| ⇨ |
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: - Astigmatism is corrected by using
- A radiotransmitter radiates 1 kW power at a wavelength 198.6 m. How many photons
- A galvanometer having resistance of 50 Ω requires a current of 100μA to give full
- The number of NAND gates required to form an AND gate is
- An inclined plane of length 5.60m making an angle of 45⁰ with the horizontal is placed
Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Astigmatism is corrected by using
- A radiotransmitter radiates 1 kW power at a wavelength 198.6 m. How many photons
- A galvanometer having resistance of 50 Ω requires a current of 100μA to give full
- The number of NAND gates required to form an AND gate is
- An inclined plane of length 5.60m making an angle of 45⁰ with the horizontal is placed
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