An electron is in an infinite square well (a box) that is 2.0 nm wide. The electron makes a transition from the n = 8 to the n = 7 state,
what is the wavelength of the emitted photon?(h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19)
A) 880 nm
B) 750 nm
C) 610 nm
D) 1000 nm
E) 1100 nm
A
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The elapsed time between two successive crossings of the same meridian by a star other than the Sun is known as
a. the tropical year. b. one sidereal day. c. the sidereal year. d. none of these.
Friction: An object slides on a level floor. It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s2. What is the coefficient of kinetic friction between the object and the floor?
A. 0.24 B. 0.48 C. 0.12 D. It is impossible to determine without knowing the mass of the object.
In deriving the axial electric field for the ring-shaped charge distribution and the electric field from a long line of charge, the component perpendicular to the resulting field is zero because of what physical property?
A) only net charge is important B) positive and negative charges cancel C) superposition D) integration E) symmetry
Using the standard steam tables, calculate the coefficient of thermal expansion, ?, from its definition for steam at 450°C and pressures of 10 kPa and 1 MPa. Then compare your results with the value obtained by assuming that steam is a perfect gas and explain the difference.
GIVEN
• Steam
• Temperature = 450°C = 723 K
FIND
The coefficient of thermal expansion at 10 kPa and 10 MPa from
(a) Standard Steam tables
(b) Perfect Gas Law
PROPERTIES AND CONSTANTS
From steam tables
