Answer:
1.31 m
Explanation:
The relationship between frequency and wavelength of a sound wave is

where
c is the speed of the wave
f is the frequency
is the wavelenfth
In this problem, we have
c = 343.06 m/s
f = 261.63 Hz
So we can solve the formula for the wavelength:

Explanation:
It is known that formula for energy per unit area per unit time is as follows.
S = 
= 

E =
Now, putting the values we will calculate the electric field as follows.
E = 
=
= 1341.03 V/m
Now, we will calculate the average magnetic field as follows.
B = 
= 
=
T
= 
Thus, we can conclude that the average (rms) value of the magnetic field is
.
Answer: 3.2
Explanation:
pH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
![pH=-\log [H_3O^+]](https://tex.z-dn.net/?f=pH%3D-%5Clog%20%5BH_3O%5E%2B%5D)

Thus as pH and
are inversely related, a solution having lower pH will have more amount of
concentration. And a solution having more pH will have less amount of
concentration.
Thus the solution with lowest pH of 3.2 will have highest hydronium ion concentration.
According to newton's third law: every action has an equal and opposite reaction, so yes the ground does move backwards. You have 4 forces acting on you at any given time: pushing force, friction force, gravity, and normal force. you push against something to propel forward, you have to overcome gravity and friction, and normal force keeps things upright to prevent them from falling into each other.
<span>If everything is motionless at every instant, and time is entirely composed of instants, then motion is impossible, so it must be an illusion.
</span>
if you really want things to get confusing you can read up on zeno's dichotomy paradox stating that there is infinate amount of times you can divide something such as a distance traveled over time and you will stil