What is the order of magnitude of light year in etre?

What is the order of magnitude of the following Velocity of light.

What is the order of magnitude of the following Size of observable universe .

What is the order of magnitude of the following Size of the atom of hydrogen atom.

What is the order of magnitude of the following Size of nulceus of hydrogen atom.

What is the order of magnitude of the resistance of a human body?

What is the order of the magnitude of the denstiy of the nucleus?

What should be the order of magnitude of the minimum frequency of electromagnetic waves that could be used to detect the presence of the planet venus.

What should be the order of magnitude of the minimum fequency of electromagnetic waves that could be used to detect the presence of an aircraft 50 m long and

What should be the order of magnitude of the minimum fequency of electromagnetic waves that could be used to detect the presence of a bird 0.1m long? From what sources of electromagnetic radiation would you be able to generate radiation of these wavelengths?