In a computer monitor, electrons approach the screen at 1.20× 10 8 m/s. What is

Question

In a computer monitor, electrons approach the screen at 1.20× 108 m/s. What is the de Broglie wavelength ofthese electrons? Note: the mass of electrons is9.109 × 10–31 kg; and use therelativistic momentum in your calculation.

b. 7.85 ×10–12 m
c. 6.62 ×10–12 m
d. 4.31 ×10–12 m
e. 6.07 × 10–12 m In a computer monitor, electrons approach the screen at 1.20× 108 m/s. What is the de Broglie wavelength ofthese electrons? Note: the mass of electrons is9.109 × 10–31 kg; and use therelativistic momentum in your calculation. 7.85 ×10–12 m 6.62 ×10–12 m 4.31 ×10–12 m 6.07 × 10–12 m

Explanation / Answer

We know that :                De Broglie's wave length is :                                       =   h / P   = h / mv                                                        =  ( 6.624 x 10-34 J-s ) /(9.109 x 10-31 * 1.20 x 108 m /s)                                                         = 6.07 x 10-12   m Hope this helps u!

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