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In beta decay, a nucleus emits an electron. A 210 Bi (bismuth) nucleus at rest undergoes beta decay to $^{210} \mathrm{Po}$ (polonium). Suppose the emitted electron moves to the right with amomentum of $5.60 \times 10^{-22} \mathrm{kg} \cdot \mathrm{m} / \mathrm{s}$ . The 210 $\mathrm{Po}$ nucleus, with mass $3.50 \times 10^{-25} \mathrm{kg},$ recoils to the left at a speed of $1.14 \times 10^{-3} \mathrm{m} / \mathrm{s}$ Momentum conservation requires that a second particle, called an antineutrino, must also be emitted. Calculate the magnitude and direction of the momentum of the antineutrino that is emitted in this decay.

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$1.66 \times 10^{-22} \mathrm{kg} \cdot \mathrm{m} / \mathrm{s}$ to the left

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Cornell University

University of Washington

Hope College

University of Sheffield

Lectures

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

03:30

In physics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Given a force, F, applied for a time, t, the resulting change in momentum, p, is equal to the impulse, I. Impulse applied to a mass, m, is also equal to the change in the object's kinetic energy, T, as a result of the force acting on it.

04:26

In beta decay, a nucleus e…

11:02

In certain radioactive bet…

01:52

A radioactive nucleus, ini…

03:58

Alpha decay is nuclear dec…

05:46

The nucleus of $^{214} \ma…

05:07

The nucleus ${ }_{10}^{23}…

05:25

(a) Beta decay is nuclear …

05:03

03:52

A radioactive nucleus is a…

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