Most irregular galaxies were have thought to have been formed from collisions from other galaxies <span />
C. isotope
Isotopes have the same atomic number but different mass number because of the difference in the number of neutrons in the nucleus of the atom.
A )voltage
(i.e differance in electricity field)
Answer:
Gravity only becomes noticeable when there is a really massive object like a moon, planet or star. We are pulled down towards the ground because of gravity. The gravitational force pulls in the direction towards the centre of any object.
The frequency of the radio station is

For radio waves (which are electromagnetic waves), the relationship between frequency f and wavelength

is

where c is the speed of light. Substituting the frequency of the radio station, we find the wavelength: