Q19.A sound absorber attenuates the sound level by 20 dB . The intensity decreases by a factor of (1) 1000 (2) 10000 (3) 10 (4) 100
What This Question Tests
This question directly tests the application of the decibel formula to relate a change in sound level to the corresponding factor of change in sound intensity.
Concepts Tested
Formulas Used
β₂ - β₁ = 10 log₁₀(I₂/I₁)
📚 NCERT Sections This Tests
10.5 — In Young’S Double-Slit Experiment Using Monochromatic Light Of
Physics Class 12 · Chapter 10
10.5 In Young’s double-slit experiment using monochromatic light of wavelength l, the intensity of light at a point on the screen where path difference is l, is K units. What is the intensity of light at a point where path difference is l/3?
12.5 — A Hydrogen Atom Initially In The Ground Level Absorbs A Photon,
Physics Class 12 · Chapter 12
12.5 A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.
2.5 — A Parallel Plate Capacitor With Air Between The Plates Has A
Physics Class 11 · Chapter 2
2.5 A parallel plate capacitor with air between the plates has a capacitance of 8 pF (1pF = 10–12 F). What will be the capacitance if the distance between the plates is reduced by half, and the space between them is filled with a substance of dielectric constant 6?
📋 Question Details
- Chapter
- Waves & Sound
- Topic
- Sound intensity level, decibels
- Year
- 2007
- Shift
- Unknown
- Q Number
- Q19
- Type
- MCQ
- NCERT Ref
- Class 11 Physics Ch 15: Waves
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