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hayowazzup
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Homework Statement
Electrons are accelerated from rest by a voltage of 59.0 V. After that acceleration:
1.What is their speed?
2.What is their De Broglie wavelength?
3.The accelerated electrons are then reflected by a crystal with crystal spacing d of 0.085 nm. Through which angle are they reflected?
h = 6.63 × 10–34 J.s, c = 3 × 108 m/s, Mass of e = 9.11 × 10–31 kg, e = 1.6 × 10–19 C.
Homework Equations
The Attempt at a Solution
1. √((2*e*V)/massofe) = √((2*1.6 × 10–19 *59)/9.11 × 10–31 ) = 4552414.59 m/s
2. λ = h/p = h / √(2*h*e*massofe) = 6.63 × 10–34 / √((2*1.6 × 10–19 * 9.11 × 10–31 ) * (1E-9) = 0.16 nm
3. 2dsin (θ) = m λ
= sin-1 (1* 0.16 / (2 * 0.085)) = 70 ...<=== i m stuck because the answer in the book is 39.8
i really need help
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