Easy weird physics questions

Test Preparation SAT Subject Test Preparation
1

<p>A nucleus at rest undergoes a radioactive decay in which a beta particle (an electron) us emitted. The momentum of the electron and the nucleus remaining after the decay is not zero. This can be explained by which of the following ?</p>

<p>a) The decay does not conserve energy (not this)
b) Another particle besides the electron was emitted during the decay
c) The nucleus has changed its atomic number during the decay
d) The nucleus has changed its atomic mass during the decay (not this)
e) The electron has undergone further decay after the first decay (not this) </p>

<p>The measurement of the Hubble constant provides an oppurtunity to make scientific inferences regarding</p>

<p>a) long term predictions for the lifetimes of orbiting telescopes in space
b) the age of the universe
c) the prediction of orbit of comets
d) the physical processes occurring in quasars
e) the temperature of the surfaces of red giant stars </p>

<p>And thanks ((((((((((:::::::::</p>

2

<p>Anyone pleaaase answer these </p>

<p>the first is either b or c
the second maybe b </p>

<p>helppppppppp</p>

3

<p>First I think is C and second I think is B or A</p>

<p>Any other answers don’t really make sense for the second one. And I am recalling this from physics junior year but I swear I heard something about an atomic number changing</p>

4

<p>In a typical beta decay, a neutrino is emitted as well. (The non-conservation of momentum for the electron and nucleus is how the neutrino was discovered.)</p>

<p>The Hubble constant represents the rate of expansion of the universe and is related to the age of the universe.</p>

<p>Wikipedia and other sources are your friends, they are much faster than waiting for someone here to answer…</p>