What resolving power must a diffraction grating have in order to distinguish wavelengths of 686.30 nm and 687.50 nm? (1 nm = 10?9 m)
a. 343
b. 572
c. 686.9
d. 915
e. 687.5
b
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A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation x(x, t) = 2.1 cm cos(2000 rad/s t - 40
x). What is the direction of the velocity of the wave?
A. the - x direction B. the + x direction C. the - y direction D. the + y direction
The 
O nucleus is unstable. To what will it decay?
A.
N + e+ + ?
B. 
N + e+ + ?
C. N + e- +
D.
N + e+ + ?
E. F + e- +
What is one reason that early life formed cells?
A) cell walls prevent heat from escaping B) cells concentrate molecules together so they react more easily C) only cells can replicate D) biological reactions can occur only within cells
It takes fewer and fewer workers to produce crops in developed countries because of substitution of machines that ultimately run on fossil fuel for hand labor
What will be an ideal response?