Which statement about the atomic nucleus is correct?
a. The nucleus is made of protons and neutrons and has a negative charge,
b. The nucleus is made of protons and neutrons and has a positive charge.
C. The nucleus is made of electrons and has a positive charge.
d. The nucleus is made of electrons and has a negative charge,
Please select the best answer from the choices provided

According to the phase diagram for water, how is the state of water determined? proceed up a vertical line at any given temperature read the phase at the intersection of any given temperature and pressure at a given pressure, proceed horizontally to the s-l or l-g line

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease