Answer: the intensity of sound at a rock concert will be 6.31 × 10^12 time louder than that of a whisper.
Explanation: Given that sound at a rock concert power is 130 dB of intensity l2
a whisper power is 2 dB of intensity l1
Using the formula
130dB - 2dB = 10Log(I2/I1)
128/10 = logI2/I1
12.8 = log (I2/I1)
I2/I1 = 6.31 × 10^12
Therefore, the intensity of sound at a rock concert will be 6.31 × 10^12 time louder than that of a whisper.
Answer:
The mercury in the barometer will go down as there is less air pressing down on the bulb of the barometer to push mercury up.
Explanation:
<span>Spring tides have higher high tides and lower low tides when the moon, sun, and earth are aligned in a row. Why does this occur?
A.gravitational pull is stronger
</span>
Answer:
0.00073
Explanation:
= Fraction of atoms of the element in the excited state
= Fraction of states
T = Temperature = 4471 K
h = Planck's constant =
= Boltzmann constant =
= Wavelength = 407.3 nm
We have the relation
Change in energy is given by
The fraction of atoms of the element in the excited state is 0.00073