The focal point of a lens is determined by
A. both shape and index of refraction.
B. only the shape if you have a negative lens, otherwise only the index of refraction.
C. the index of refraction of the lens material.
D. the shape of the two surfaces of the lens.
Answer: A
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Matter falling into a black hole converts _______________ energy into thermal energy
Fill in the blank(s) with correct word
The type of EM radiation that has wavelength just a bit longer than that of visible light is
a. ultraviolet b. infrared c. x ray d. microwave e. gamma ray
The Sun projects charged particles into space, giving rise to a flow of radiation called the
a. heliosphere. b. solar wind. c. corona. d. chromosphere.
Two parallel wires run in a north-south direction. The eastern wire carries 15.0 A southward while the western wire carries 6.0 A northward. If the wires are separated by 30 cm, what is the magnetic field direction at a point between the wires at a distance of 10 cm from the western wire?
A. 3.0
T
B. 6.0T
C. 15T
D. 27T
E. 90T