A student has two diffraction gratings, a measuring tape, a monochromatic light source of unknown wavelength, and a clamp a known distance L from the white wall to be used as a screen. One diffraction grating has a known distance d1 between slits; the other has the unknown distance we will call d2. To find the distance d2, the student must take which data?
1.measure the distance from the central maximum to the first order maximum while the first diffraction grating is in the clamp
2.measure the distance from the central maximum to the first order maximum while the second diffraction grating is in the clamp
3.both of these choices
4.None of these choices—there are too many unknowns to find the distance in question.
3
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Which of the following is FALSE?
a) Light, radio, ultraviolet, and gamma rays are all forms of electromagnetic radiation. b) Emission spectra are characterized by narrow, bright lines of different colors. c) An absorption spectrum appears as a continuous spectrum interrupted by a series of dark lines. d) The energy of a photon is inversely proportional to the wavelength of the radiation. e) The wavelengths of the emission lines produced by an element are different from the wavelengths of an absorption line produced by the same element.
If you swing a bucket of water fast enough in a vertical circle, at the highest point the water does not spill out. This happens because an outward force balances the pull of gravity on the water
A) True B) False
A magnetic compass points towards the north geographic pole of the Earth because
A. there is a south magnetic pole near the north geographic pole. B. there is a north magnetic pole near the north geographic pole. C. all magnetic poles, north or south, point that way due to the spin of the Earth. D. the static electricity in the atmosphere causes the alignment of the compass.
The SI unit of pressure is __________
Fill in the blank(s) with correct word