Question

a 25 eV electron has a speed of ​

Answer 1

Answer:

Since 25 eV is small compared to the mass of the electron (511 keV), you can assume this is the kinetic energy of the electron. Convert to joules then use the formula E = 1/2 m v^2 to calculate v.

Explanation:

K.E=1/2mv^2 K.E=2heV => 25×1.6×10^-19 J => 40×10^-19 J Now 40×10^-19=1/2 (9.11×10^-31) v^2 1/2 (v^2)=40×10^-19/9.11×10^-31 1/2 v^2 =4.3×10^12 V^2=9×10^12 V=square root of 9×10^12 V=3×10^6 m/s

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