Hydrogen gas is harmless to your feet so since you don’t need protection against it that seems the best answer.
It would be 12W because: 6v is half of 12v so half of 24w would be 12w
Electrical energy is your answer.
Answer:
here as we increase the distance the intensity will decrease and hence the amplitude of the electric field will decrease and vice-versa
Explanation:
As wee know that the amplitude of the wave will decide the energy of the wave
Here we know that energy density of electromagnetic wave is given as

now we have

so here we can say that intensity of the wave at the given distance from the source is given by formula

so here as we increase the distance the intensity will decrease and hence the amplitude of the electric field will decrease and vice-versa.