The acceleration of a cart rolling down an inclined plane (a ramp)
A) is approximately constant.
B) increases with time.
C) decreases with time.
Answer: A
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Which of the following could be the molecular formula for an alkene?
a. C9H9 b. C6H12 c. C9H17 d. C5H8 e. C2H6
In a two-slit experiment using coherent light, the distance between the slits and the screen is 1.10 m, and the distance between the slits is 0.100 mm
If the first-order bright fringe is measured to be 3.40 cm from the centerline, what is the wavelength of the light? A) 3.09 ?m B) 241 nm C) 2.11 ?m D) 354 nm E) 133 nm
How do astronomers infer the presence of magnetic fields in molecular clouds?
A) by measuring the amount of interstellar reddening B) by measuring the Doppler shifts of emission lines from gas clumps in the cloud C) by measuring the infrared light emitted by the cloud D) by measuring the polarization of starlight passing through the cloud E) by measuring the amount by which gravity is reduced
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?