Author Question: Because the factor h on the right side of the Heisenberg uncertainty principle has units of ... (Read 66 times)

joesmith1212 · **on:** Aug 10, 2020

Question 1

Because of Heisenberg's Uncertainty Principle, the velocity of a particle is known least precisely when the length of the wave packet representing the particle is

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< 10⁻¹⁵ m.

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< 10⁻¹⁰ m.

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of the order of 1.00 m.

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>10 m.

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the length of a plane wave (infinite)

Question 2

Because the factor h on the right side of the Heisenberg uncertainty principle has units of Joule-seconds, it suggests that the energy of a system also has uncertainty. The uncertainty in energy depends on the length of the time interval during which a system exists. ΔEΔt≥h/4π. Suppose an unstable mass is produced during a high-energy collision such that the uncertainty in its mass is m_e/100. (m_e = 9.11 × 10⁻³¹ kg.) How long will this particle exist?

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6.4 × 10⁻²⁰ s

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2.3 × 10⁻²³ s

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1.0 × 10¹⁵ s

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1.2 × 10¹³ s

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8.1 × 10⁻¹⁹ s

aliotak · **Reply #1 on:** Aug 10, 2020

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