A.) prove that the anti-commutator of any two operators, {a, b} = ab+ ba , is hermitian if the operators are hermitian.
b.) prove that the commutator of any two hermitian operators is anti-hermitian ( anti-hermitian satisfies if \hat{c} = - \hat{c}^\dagger , and hermitian satisfies if \hat{c} = \hat{c}^\dagger ).

Which of the following are risk factors for emphysema ? correct answer : a and and c          good luck and have a nice benevolentpuppy day! : )

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.

How are period and frequency related to each other? dperiod is the reciprocal of frequency.

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