Problem: Planck constant:

Classical statistical mechanics requires the existence of h (but does not define its value). Eventually, following upon Planck's discovery, it was recognized that physical action cannot take on an arbitrary value. Instead, it must be some multiple of a very small quantity, the "quantum of action", now called the Planck constant. Classical physics cannot explain this fact. In many cases, such as for monochromatic light or for atoms, this quantum of action also implies that only certain energy levels are allowed, and values in between are forbidden.

What is not required to exist in modern statistics mechanics?
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A: unanswerable


Problem: Cork (city):

While local government in Ireland has limited powers in comparison with other countries, the council has responsibility for planning, roads, sanitation, libraries, street lighting, parks, and a number of other important functions. Cork City Council has 31 elected members representing six electoral wards. The members are affiliated to the following political parties: Fine Gael (5 members), Fianna Fáil (10 members), Sinn Féin (8 members), Anti-Austerity Alliance (3 members), Workers' Party (1 member), Independents (4 members). Certain councillors are co-opted to represent the city at the South-West Regional Authority. A new Lord Mayor of Cork is chosen in a vote by the elected members of the council under a D'Hondt system count.

Where does the Worker's Party represent the city?
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A: unanswerable


Problem: Computer security:

Computer security, also known as cybersecurity or IT security, is the protection of information systems from theft or damage to the hardware, the software, and to the information on them, as well as from disruption or misdirection of the services they provide. It includes controlling physical access to the hardware, as well as protecting against harm that may come via network access, data and code injection, and due to malpractice by operators, whether intentional, accidental, or due to them being tricked into deviating from secure procedures.

How can a computer be attacked?
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A: unanswerable


Problem: Uranium:

A team led by Enrico Fermi in 1934 observed that bombarding uranium with neutrons produces the emission of beta rays (electrons or positrons from the elements produced; see beta particle). The fission products were at first mistaken for new elements of atomic numbers 93 and 94, which the Dean of the Faculty of Rome, Orso Mario Corbino, christened ausonium and hesperium, respectively. The experiments leading to the discovery of uranium's ability to fission (break apart) into lighter elements and release binding energy were conducted by Otto Hahn and Fritz Strassmann in Hahn's laboratory in Berlin. Lise Meitner and her nephew, the physicist Otto Robert Frisch, published the physical explanation in February 1939 and named the process "nuclear fission". Soon after, Fermi hypothesized that the fission of uranium might release enough neutrons to sustain a fission reaction. Confirmation of this hypothesis came in 1939, and later work found that on average about 2.5 neutrons are released by each fission of the rare uranium isotope uranium-235. Further work found that the far more common uranium-238 isotope can be transmuted into plutonium, which, like uranium-235, is also fissile by thermal neutrons. These discoveries led numerous countries to begin working on the development of nuclear weapons and nuclear power.

When was it observed that bombarding uranium with neutrons results in beta ray emission?
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A:
1934