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protons are being accelerated in a particle accelerator. When the speed of the protons is doubled,...

protons are being accelerated in a particle accelerator. When the speed of the protons is doubled, their de Broglie wavelength will
a) increase by a factor of 4
b) increase by a factor of 2
c) decrease by a factorof 2
d) increase by a factor of sqr root(2)
e) decrease by a factor of sqr root(2)

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