The Lyman series of hydrogen corresponds to electron transitions from higher levels to n = 1 . What is the longest wavelength in that series? (h = 6.63 × 10^-34 J×s. The ground state of hydrogen is at –13.6 eV.)
a. 91.4 nm
c. 456 nm
b. 273 nm
d. 122 nm
D
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Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.The quantity Fd/t is
a. the kinetic energy of the crate. b. the potential energy of the crate. c. the linear momentum of the crate. d. the work you do on the crate. e. the power you supply to the crate.
Sometimes an experiment requires a certain pure gas to be used at reduced pressure
One way to achieve this is to purchase a sealed glass container filled with the gas, and to introduce the gas into a vacuum by attaching the glass container to the vacuum chamber and breaking the tip of the glass container using a metallic bean and a magnet. If the volume of the glass container is 1.0 L and it is at a pressure of 1.0 × 105 Pa and if the vacuum chamber has a volume of 2.0 L, what will the pressure be after the gas, which is to be assumed to be an ideal gas, is released into the vacuum chamber and the temperature has returned to its original value? (Note that the glass container remains part of the system.) A) 33 kPa B) 50 kPa C) 300 kPa D) 200 kPa
When the huge polar caps on Mars form every winter, they are made chiefly of ________
Fill in the blank(s) with correct word
Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 73 hours the star becomes dimmer for about 2 hours
The change in brightness alternates between a small change and a large change. The most likely explanation is that ________. A) the star is a member of an eclipsing binary star system B) the star is periodically ejecting gas into space, every 73 hours C) the star is a Cepheid variable D) the star is a white dwarf