In a single-slit diffraction experiment, a beam of monochromatic light of wavelength 630 nm is incident on a slit of width 0.400 mm. If the distance between the slit and the screen is 1.80 m, what are the positions of the first dark fringes?
A) 0.440 × 10-3 m
B) 0.870 × 10-3 m
C) 1.30 × 10-3 m
D) 1.65 × 10-3 m
E) 2.84 × 10-3 m
E
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Why are star clusters almost ideal "laboratories" for stellar studies?
A) All stars in the cluster are the same size and luminosity. B) Their combined light makes them much easier to spot from a distance. C) Stars in clusters have the same age, similar composition, and are at the same distance away. D) Stars in clusters are all relatively young and therefore shine brightly. E) Like our Sun, stars in clusters are always located in the plane of the Milky Way Galaxy.
One reason why we know that magnetic fields are not the same as electric fields is because the force exerted on a charge +q
a. is in opposite directions in electric and magnetic fields. b. is in the same direction in electric and magnetic fields. c. is parallel to a magnetic field and perpendicular to an electric field. d. is parallel to an electric field and perpendicular to a magnetic field. e. is zero in both if the charge is not moving.
The difference between a DC and an AC generator is that
a. the DC generator has one unbroken slip ring. b. the AC generator has one unbroken slip ring. c. the DC generator has one slip ring split in two halves. d. the AC generator has one slip ring split in two halves. e. the DC generator has two unbroken slip rings.
What are the satellites of the outer planets thought to be composed of?
A. water and carbon dioxide B. ice and rock C. hydrogen and methane D. hydrogen and helium