The spectrum of a mercury vapor lamp under very high pressure appears as that from
A) an incandescent source.
B) a laser.
C) an ultraviolet source.
D) a gas other than mercury.
E) a monochromatic source.
Answer: A
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A contact lens is made of plastic with an index of refraction of 1.50 . The lens has an outer radius of curvature of +2.0 cm and an inner radius of curvature of +2.5 cm. What are the focal length and the power of the lens?
What is the key distinction between protostars and true (main-sequence) stars?
A) Protostars generate most of their energy from gravitational contraction, and stars generate it from nuclear fusion. B) Protostars are larger and more luminous than stars. C) Protostars have stronger magnetic fields than stars. D) Protostars are supported by thermal pressure, and stars are supported by degeneracy pressure.
Which is the latest stage (of those given below) in the evolution of a star?
A) red giant B) white dwarf C) protostar D) geodesic E) supernova
A straight wire of length 70 cm carries a current of 50 A and makes an angle of 60° with a uniform magnetic field. If the force on the wire is 1.0 N what is the magnitude of B?
A. 41 mT B. 33 mT C. 55 mT D. 87 mT E. 57 mT