Question

An electron with kinetic energy 5 keV and mass 1.6 x 10 -27 kg was

detected in a cosmic ray experiment. Calculate its velocity in m/s. Given

1 keV= 1000 eV.​

Answer 1

Step-by-step explanation:

KE = ½ mv²

5000 = ½ × 1.6 x 10-²⁷ × v²

10000 = 1.6 x 10-²⁷ × v²

v² = 10000 x 10-²⁷ ÷ 1.6

v² = 6.25

v = 2.5

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