In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

In 1925, Hungarian inventor Boris Aivaz patented the process of making a cigarette filter from crepe paper.
what was the first cigarette with a filter

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger -- Marsden gold foil experiment. After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud. Protons and neutrons are bound together to form a nucleus by the nuclear force.
who said most of an atoms mass is in the nucleus

The wavelength is the distance from one peak of the wave's electric field (wave's peak / crest) to the next, and is inversely proportional to the frequency of the wave. The distance a radio wave travels in one second, in a vacuum, is 299,792,458 meters (983,571,056 ft) which is the wavelength of a 1 hertz radio signal. A 1 megahertz radio signal has a wavelength of 299.8 meters (984 ft).
the wave length of radio wave is 1m its frequency is