tailieunhanh - CRC Press - Dictionary of Material Science and High Energy Physics - D. Basu (2001) Episode 3

Tham khảo tài liệu 'crc press - dictionary of material science and high energy physics - d. basu (2001) episode 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | degree of freedom 1 A distribution function may depend on several variables that vary stochastically. If these variables are statistically independent then each represents a degree of freedom of the distribution. 2 The number of independent coordinates needed for the description of the microscopic state of a system is called the number of degrees of freedom. For example a single point particle in three-dimensional space has three degrees of freedom a system of N point particles has 3N degrees of freedom. De Haas-Van Alphan effect In 1930 De Haas and Van Alphan measured the magnetic susceptibility x of metal Bi at a low temperature and strong magnetic field. They found that x oscillated along with the change of magnetic field. This phenomenon is called the De Haas-Van Alphan effect. delayed choice experiment Gedanken variant of the two-slit interference experiment with photons in which the slits and screen are replaced by two half-silvered mirrors. When only the first mirror is in place it is possible to tell which path a photon takes. When both mirrors are in place however interference is observed and the which path information is lost. In the delayed choice experiment the decision to insert or not insert the second mirror is made after the photon has classically speaking passed the first mirror. Nevertheless it is apparent that interference is observed when and only when the second mirror is in place. The experiment further confirms quantum mechanical precepts that it is not possible to assign a meaning to the notion of a trajectory to a particle in the absence of an apparatus designed to measure the trajectory. delayed emission De-excitation of an excited nucleus usually occurs rapidly 10-8s after formation by gamma emission electromagnetic interaction . Emission of protons or neutrons from a nucleus occurs on much shorter time scales due to the fact that the hadronic interaction is much stronger. Occasionally weak decay of an unstable nucleus occurs. If .

TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.