Why might the following nuclear reaction not be very good for energy production in a fusion reactor? Fe + Fe ? Te
A) The material only produces a few neutrons so the chain reaction will not be very efficient.
B) The reactants are too stable and it would cost energy to produce the product due to strong nuclear force.
C) The products are not the right size to obtain any energy from the missing mass due to the strong nuclear force.
D) The mass of the byproducts is too high and therefore the energy released will not be high enough.
E) Interatomic attraction between the products will impede the separation of the atoms from the unstable nuclei.
B
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The case of the passenger pigeon best illustrates the
A. strength of natural selection. B. theory of evolution. C. concept of coevolution. D. role humans play in extinction of species. E. excellence of enforcing laws to protect species.
Our ears are best at hearing
A. infrasonic sound. B. ultrasonic sound. C. both of these D. none of the above
Which of the following factors mainly determines the temperature at which water boils?
A. air temperature B. air pressure C. air density D. relative humidity
How did Vine and Matthews relate the seafloor-spreading hypothesis to magnetic reversals of the Earth's poles?
a. New crust created at a transform fault recorded high magnetism during periods of normal polarity and low magnetism during periods of reversed polarity. Older crust of alternating magnetism is pushed away from the ocean ridge as new crust is created. b. New crust created at an ocean ridge recorded high magnetism during periods of normal polarity and low magnetism during periods of reversed polarity. Older crust of alternating magnetism is pushed away from the ocean ridge as new crust is created. c. New crust created at an ocean ridge recorded low magnetism during periods of normal polarity and high magnetism during periods of reversed polarity. Older crust of alternating magnetism is pushed away from the ocean ridge as new crust is created. d. New crust created at an ocean ridge recorded high magnetism during periods of normal polarity and low magnetism during periods of reversed polarity. Newer crust of alternating magnetism is pushed away from the ocean ridge as new crust is created. e. New crust created at deep-sea trench recorded high magnetism during periods of normal polarity and low magnetism during periods of reversed polarity. Older crust of alternating magnetism is pushed away from the ocean ridge as new crust is created.