In most months, there are no eclipses
a. True
b. False
Indicate whether the statement is true or false
True
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The element iron, having atomic number 26, is the "crossover point" between fusion and fission. Why?
A) Because all elements heavier than iron are radioactive, implying that they will fission easier than they will fuse. B) Because of the neutron balance that results from splitting a nucleus. C) Because for elements lighter than iron, fusion converts nuclear energy to non-nuclear energy, whereas for elements heavier than iron, fission converts nuclear energy to non-nuclear energy. D) Because neutrons will only split the elements that are heavier than iron. E) Because for elements lighter than iron, fusion converts non-nuclear energy to nuclear energy, whereas for elements heavier than iron, fission converts non-nuclear energy to nuclear energy.
Two slits are illuminated with green light (l = 540 nm). The slits are 0.05 mm apart and the distance to the screen is 1.5 m. At what distance (in mm) from the central maximum on the screen is the average intensity 50% of the intensity of the central maximum?
a. 1 b. 3 c. 2 d. 4 e. 0.4
Basic Postulates: One of Einstein's postulates in formulating the special theory of relativity was that the laws of physics are the same in reference frames that
A. accelerate. B. move at constant velocity with respect to an inertial frame. C. oscillate. D. are stationary, but not in moving frames.
State the physical characteristics of the three types of radiation from radioactive sources