What are the controversies of Austrian physicist Mach in his life?

Ernst mach (1838 ~ 19 16), an Austrian Czech physicist, philosopher and biologist, was born in Chiritz in February/838 (179 years ago). Father is a tutor. When he was a child, he was good at observing the causal relationship of things with hearing and touch under the charm of nature. When he was in junior high school, he was not interested in the curriculum of missionary schools and was regarded as a child who was not suitable for learning knowledge and had poor grades. His father's library became a treasure house for his self-study. He studied mathematics, physics and philosophy at the University of Vienna, and graduated from 1860 with a doctorate. 1864- 1867 was appointed professor of mathematics and experimental physics at Graz university, 1867- 1895 was appointed professor of experimental physics at Prague university, and was elected president twice. 190 1 year retired, but still continued to engage in scientific writing at home. 19 16 February 19 died in the tester.

Mach devoted his life to the research of experimental physics and philosophy. He published more than 100 research papers and reports on mechanics, acoustics and optics. When he studied the high-speed motion of objects in gas, he found the shock wave. The ratio of object speed to sound speed (Mach number) is determined as the standard to describe the supersonic motion of an object. Mach effect, Mach wave, Mach angle and other terms named after Mach are widely used in aerodynamics, which is Mach's historic contribution to mechanics. He first demonstrated the acoustic Doppler effect with instruments and put forward the N-dimensional atomic theory.