A transverse periodic wave is represented by the equation y(x, t) = 2.50 cm cos(2,500 rad/s t - 15.0
x). What is the direction of the velocity of the wave?
A. the + z direction
B. the + y direction
C. the + x direction
D. the - z direction
E. the - y direction
F. the - x direction
C. the + x direction
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For the following balanced equation, which has the highest coefficient?
4 H2 + 2 C ? 2 CH4 A) H2 B) C C) CH4 D) H4 E) none of the above
The plate gradually oxidizes over time so that the surface emissivity increases to 0.5. Calculate the resulting temperature in the plate including radiation heat transfer to the surroundings at the same temperature as the ambient temperature.
GIVEN
Plate in Problem 4.34 oxidizes
FIND
(a) New temperature distribution considering radiation heat transfer
ASSUMPTIONS
(a) Neglect temperature gradients through the plate thickness
SKETCH
The proton-proton chain requires a temperature of 100 million K to get started
Indicate whether the statement is true or false
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?