Who discovered the mass spectrometer?
A. Francis Aston
B. J. J Thomson
C. Ernest O. Lawrence
D. Walter Kaufmann
Answer:B
Who discovered the mass spectrometer?
A. Francis Aston B. J. J Thomson C. Ernest O. Lawrence D. Walter Kaufmann
Explanation: The mass spectrometer was invented by JJ THOMSON. He performed a series of experiments in 1897 designed to study the nature of electric discharge in a high-vacuum cathode-ray tube. Further modified by F. W. Aston shortly after World War I. He constructs the first velocity focusing mass spectrograph which has mass resolving power of 130.