Why are force fields used to describe magnetic force?
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a. magnetic force acts between two objects that are not touching.
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b. magnetic force is a form of gravity.
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c. magnetic force can only attract objects.
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d. magnetic force acts between any two objects with mass.
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Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k

This is the number of complete movements of a wave per second.