Question

(I) A free neutron (m = 1.67 × 10⁻²⁷ kg) has a mean life of 880 s. What is the uncertainty in its mass (in kg)?

(II) What minimum frequency of light is needed to eject electrons from a metal whose work function is 4.8 × 10−19 ? and give the ejected electron a kinetic energy of 150???

(III) If an electron’s position can be measured to a precision of 12 nm.

1. what is the uncertainty in its speed?
2. Assuming the minimum speed must be at least equal to its uncertainty, what is the electron’s minimum kinetic energy? assume an uncertainty in speed of 1.2 × 10^4 ?/?

Answer 1

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