Electrons Are Accelerated to a Speed of 4

question 18

Multiple Choice

Electrons are accelerated to a speed of 4.0 × 10⁴ m/s and are aimed at a double-slit apparatus.Interference fringes are detected.If the electrons were replaced by neutrons,what speed must neutrons have to produce interference fringes with the same fringe spacing as that observed with the electrons?

• A)2.2 × 10¹ m/s
• B)7.3 × 10⁷ m/s
• C)1.7 × 10⁶ m/s
• D)9.3 × 10² m/s

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