Each pattern shown below would appear on a screen when monochromatic light of wavelength ? first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case does the slit have the narrowest width?
A.
B.
C.
D.
E.
Answer: D
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Consider a converging lens forming an image on a screen. What property of the image would be affected by covering the top half of the lens?
What will be an ideal response?
According to Einstein's theory of relativity, the universe is made of
A) matter and anti-matter. B) radiation. C) energy. D) popcorn. E) matter.
There are three flavors of quarks
Indicate whether the statement is true or false
Why does the Sun brighten with time?
A) as time progresses, helium starts to fuse in the core, in addition to hydrogen, leading to an increase in brightness B) as hydrogen is converted into helium in the core, the number of hydrogen nuclei decreases, decreasing the fusion rate. To maintain the balance with gravity pressing inward, the core compensates by shrinking and heating up C) as time progresses, more and more heat is trapped inside the core, leading to an increase in brightness D) as hydrogen is converted into helium in the core, the number of hydrogen nuclei decreases, decreasing the fusion rate. To maintain the balance with gravity pressing inward, the core compensates by expanding and cooling