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Physics 102 Disc Ch. 30 2010

# Physics 102 Disc Ch. 30 2010 - ∆ p in its momentum(b What...

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55. •• A beam of neutrons with a de Broglie wavelength of 0.250 nm diffracts from a crystal of table salt, which has an interionic spacing of 0.282 nm. (a) What is the speed of the neutrons? (b) What is the angle of the second interference maximum? 55.(a) 34 9 27 6.63 10 J s (0.250 10 m)(1.675 10 kg) 1.58 km/s h p h mv h v m λ λ - - - = = = × = × × = (b) 1 1 2 sin sin 2 (2)(0.250 nm) sin 2(0.282 nm) 62.4 d m m d θ λ λ θ - - = = = = ° 67. •• The uncertainty in an electron’s position is 0.15 nm. (a)
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Unformatted text preview: ∆ p in its momentum? (b) What is the kinetic energy of an electron whose momentum is equal to this uncertainty ∆ p p = b g ? 67.(a) 34 9 25 4 4 6.63 10 J s 4 (0.15 10 m) 3.5 10 kg m/s---∆ ∆ ≥ ∆ ≥ ∆ × × ∆ ≥ × ∆ ≥ × × h p x h p x p p π (b) ( 29 2 25 m 2 2 s 20 31 3.5 10 kg 6.7 10 J 2 2 2(9.11 10 kg)---× × ∆ = = = = × × p p K m m...
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