Why would it be impossible to obtain interference fringes in a double-slit experiment if the separation of the slits is less than the wavelength of the light used?
What will be an ideal response?
In no direction could a path difference as large as one wavelength be obtained, and this is needed if a bright fringe, in addition to the central fringe, is to be observed.
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A gas-filled vertical cylinder, closed at the bottom end, is fitted at the top with a piston that can move freely. The mass of the piston is 10.0 kg, and the initial height of the piston above the bottom of the cylinder is 25 cm
A mass of 8.0 kg is placed on the piston. What is the resulting height of the piston, assuming that the temperature of the ideal gas is kept constant? A) 12 cm B) 13 cm C) 14 cm D) 15 cm E) 16 cm
A block of wood is given a brief push and then allowed to slide [without further pushing] along a table top, slowing down as it moves toward the east. As the block slides,
A) its velocity is toward the west. B) it has no acceleration. C) its acceleration is toward the west. D) its acceleration is toward the east. E) the net force on it is zero.
A diffraction grating has rulings of 890 lines/mm. When white light is incident normally on the grating, what is the longest wavelength that forms an intensity maximum in the fifth order?
A) 225 nm B) 200 nm C) 250 nm D) 275 nm E) 300 nm
Kepler's second law tells us that a planet sweepa out equal areas in equal times. If you compare the amount of area per time swept by Earth with the one of Jupiter, you would conclude:
A) They sweep the same area per time. B) Jupiter sweeps a larger area per time because it has much more mass than Earth. C) Jupiter sweeps a larger area per time because it has a much larger orbital path than Earth. D) Earth sweeps a larger area per time because it has much less mass than Jupiter. E) Earth sweeps a larger area per time because it has a much smaller orbital path than Jupiter.