A metallic sheet has a large number of slits, 5.0 mm wide and 20 cm apart, and is used as a diffraction grating for microwaves
A wide parallel beam of microwaves is incident normally on the sheet. If the microwave wavelength is 6.0 cm, what is the largest angle away from the central maximum at which an intensity maximum occurs.
A) 74° B) 64° C) 79° D) 69° E) 84°
B
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The Babcock model explains:
A) the changes in the wavelengths of radiation. B) the process behind quantum jumps. C) how the Coulomb force helps in binding electrons to an atom. D) the reversal of the Sun's magnetic field from cycle to cycle.
If work was done on an object, the object must have
A. experienced a frictional force. B. accelerated. C. changed its position. D. changed only its direction of motion.
If a string of length L, fixed at both ends, is made to resonate at its lowest possible frequency, what is the wavelength associated with that resonance?
A. L B. 2L C. L/2 D. 0.707L E. 1.414L
During the Mesozoic, the supercontinent of Pangaea fragmented into
A) Laurasia and Gondwanaland. B) a rift zone between Africa and Europe. C) the present-day continents we see today. D) four quadrants.