_____ is a method for expressing very large or very small numbers by using powers of 10
A) Scientific notation
B) The octal numeral system
C) The binary number system
D) Theoretical notation
A
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Star A and star B have the same temperature, but different luminosities. What can you infer about these two stars?
A) Star A must be bigger. B) Star B must be bigger. C) Star A must be redder. D) Star B must be redder. E) Nothing can be inferred from the information given.
Take the lens maker equation and show that a lens which has been turned around (surface 1 becomes 2 and 2 becomes 1 ) has the same focal length
What will be an ideal response?
An electron in an infinite potential well (a box) makes a transition from the n = 3 level to the ground state and in so doing emits a photon of wavelength 20.9 nm
(c = 3.00 × 108 m/s, h = 6.626 × 10-34J ? s, mel = 9.11 × 10-31 kg) (a) What is the width of this well? (b) What wavelength photon would be required to excite the electron from its original level to the next higher one?
The reason an astronaut in an earth satellite feels weightless is that
A) the astronaut is beyond the range of the earth's gravity. B) the astronaut is falling. C) the astronaut is at a point in space where the effects of the moon's gravity and the earth's gravity cancel. D) this is a psychological effect associated with rapid motion. E) the astronaut's acceleration is zero.