What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 8 jumps to the final state n = 2? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 205 nm
B) 104 nm
C) 389 nm
D) 486 nm
E) 610 nm
C
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Car A rear ends Car B, which has twice the mass of A, on an icy road at a speed low enough so that the collision is essentially elastic. Car B is stopped at a light when it is struck. Car A has mass m and speed v before the collision. After the collision
A. each car has half the momentum. B. car A stops and car B has momentum mv. C. car A stops and car B has momentum 2mv. D. the momentum of car B is four times as great in magnitude as that of car A. E. each car has half of the kinetic energy.
A boat moves at 10.0 m/s relative to the water. If the boat is in a river where the current is 2.0 m/s, how long does it take the boat to make a complete round trip of 1.00 km upstream followed by a 1.00 km trip downstream?
What will be an ideal response?
Why do stars appear to twinkle?
What will be an ideal response?
The highest energy level in an atom is its
a. ionization level. b. emission level. c. absorption level. d. photon level. e. ground state.