A thin ribbon of a silver alloy 2.00-cm wide and 0.015 0-mm thick carries a current of 6.98 A perpendicular to a magnetic field. The Hall voltage is found to be 1.24 × 10^?4 V when the magnetic field is 2.50 T. Calculate n, the number of charge carriers per cubic meter
5.86 × 10^28/m3
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Which is more common: a star blows up as a supernova, or a star ejects a planetary nebula?
A) Planetary nebulas are more common. B) Supernovae are more common. C) They both occur in about equal numbers. D) It is impossible to say.
A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the angular magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A) 5.0 B) 3.0 C) 4.0 D) 1.0 E) 2.0
An unclad optical fiber has index of refraction 1.40 . What is the acceptance angle for this fiber if it is submerged in a fluid with index of refraction 1.30? The acceptance angle is the greatest angle at which the light enters the end of the fiber and still causes total internal reflection
a. 69.0° c. 45.8° b. 23.6° d. Any angle will be accepted.
What happens to a star when the fusion cycle gets to the element iron?
What will be an ideal response?