Yes it is it is btw there is no picture if you were meaning to put one
Something that is not magnetic
To solve the problem it is necessary to apply the definition of Newton's second Law and the definition of density.
Density means the relationship between volume and mass:

While Newton's second law expresses that force is given by
F = ma
Where,
m = mass
a= acceleration (gravity at this case)
In the case of the given data we have to,


In equilibrium, the entire system is equal to zero, therefore


Where,
Weight of balloon
Weight of helium gas
Bouyant force
Then we have,


Replacing the values we have that


Now by ideal gas law we have that



But the relation \frac{n}{m} is equal to the inverse of molar mass, that is



Therefore the pressure of the helium gas assuming it is ideal is 0.61Mpa
Explanation:
Given that,
Maximum potential, V = 4. mV
Distance, d = 0.350 m
Frequency of the wave, f = 100 Hz
(a) The maximum electric field strength created is given by:

(b) The corresponding maximum magnetic field strength in the electromagnetic wave is given by :

(c) The wavelength of the electromagnetic wave can be calculated as :

So, the wavelength of the electromagnetic wave is
.