That statement is as false as false can be.
Roughly 78% of the Earth's surface is covered by water,
and Hydrogen is a major component of water.
On the surface of the Earth, you really have to try hard
to be far away from a cheap source of Hydrogen.
Answer:
I don't know the answer
Explanation:
I just want the point sorry (\_/)
( - ×)
o o
Answer:
Reading is close to (b) 13.44 which is the best estimate of the period
Associated error, 
Given:






Solution:
1.The best estimate of the period can be calculated by the mean of the measurements and the one closest to the mean is the best estimate of the measurement:




It is close to 13.44 s
2. Associated error is given by:


where
n = a, b,......, e
Now,






Mean Absolute Error, 


3. The assumption behind the estimation is population is considered to distributed normally.
Answer:
The third lowest frequency is 1489.27 Hz.
Explanation:
Given that,
Distance of person from one speaker= 4.50 m
Distance of person from the other = 3.80 m
The longest wavelength is the shortest frequency.
We need to calculate the difference between the speakers
The difference between the speakers d= 4.50-3.80 =0.7 m
We know that,
The longest wavelength is such that one wavelength

So, The third longest wavelength is

Put the value of d


We need to calculate the lowest frequency
Using formula of frequency



Hence, The third lowest frequency is 1489.27 Hz.