The intensity level of a "Super-Silent" power lawn mower at a distance of 1.0 m is 100 dB
You wake up one morning to find that four of your neighbors are all mowing their lawns using identical "Super-Silent" mowers. When they are each 20 m from your open bedroom window, what is the intensity level of the sound in your bedroom? You can neglect any absorption, reflection, or interference of the sound. The lowest detectable intensity is 1.0 × 10-12 W/m2.
A) 80 dB
B) 104 dB
C) 400 dB
D) 50 dB
E) 40 dB
Answer: A
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What will be an ideal response?
Compound Microscope: In a compound microscope
A. both the objective and the eyepiece form real images. B. magnification is provided by the objective lens and not by the eyepiece. The eyepiece merely increases the resolution of the image viewed. C. magnification is provided by the objective and not by the eyepiece. The eyepiece merely increases the brightness of the image viewed. D. the magnification is m1 + M2, where m1 is the lateral magnification of the objective and M2 is the angular magnification of the eyepiece. E. the image of the objective serves as the object for the eyepiece.
Compared with the sum of isolated-nucleon masses, their collective mass in a composite nucleus is
A) more. B) less. C) the same.
The amplitude of a linearly damped harmonic oscillator decreases from 60.0 cm to 40.0 cm in 10.0 s. What will be the amplitude of the harmonic oscillator after another 10.0 s passes?
A) 20.0 cm B) 16.7 cm C) 30.0 cm D) 0.00 cm E) 26.7 cm