Why are there so few tidal energy installations in existence? Explain
What will be an ideal response?
Generally, the civil engineering involved is very substantial. The cost must be
amortized and the money borrowed. Substantial civil engineering brings substantial costs.
Huge expenditures are harder to finance than smaller ones—the difficulty of obtaining the
financing is roughly proportional to the size of the money that needs to be raised to finance
the construction.
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Diffraction Gratings: A diffraction grating is to be used to find the wavelength of the emission spectrum of a gas. The grating spacing is not known, but light of a known wavelength of 632.8 nm is deflected by 43.2° in the second order by this grating. Light of the wavelength to be measured is deflected by 34.9° in the second order. What is the wavelength of the light that is to be measured?
Fill in the blank(s) with the appropriate word(s).
Consider the hydrogen atom, singly ionized helium atom, and the doubly ionized lithium atom. Arrange these atoms from highest energy ground state to lowest energy ground state
a. H, He+, Li++ b. Li++, He+, H c. H, Li++, He+ d. Since each of these atoms has only one electron, they all have the same energy ground state.
__________is an 18-year, 11 -day period after which the pattern of lunar and solar eclipses repeats
A) The Sothic cycle B) The Saros cycle C) The CNO cycle D) A Milankovitch cycle
How far does light travel in 100 years?
A: 100 miles. B: 100 wavelengths. C: 100 light years. D: 100 astronomical units. E: 100 parsecs.