What role does hydrogen play in spectral classification?
What will be an ideal response?
Its spectral lines are most obvious in mid-temperature stars and least obvious in both very hot and very cool stars.
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Uncertainty Principle Using Momentum and Position: What is the minimum uncertainty in determining the position of an electron if the speed of the electron is 6.0 km/s within an accuracy of 0.0040%? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A. 0.11 mm B. 0.15 mm C. 0.24 mm D. 0.34 mm E. 0.48 mm
A proton is placed in an electric field of intensity 700 N/C
What are the magnitude and direction of the acceleration of this proton due to this field? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C) A) 6.71 × 109 m/s2 opposite to the electric field B) 6.71 × 1010 m/s2 opposite to the electric field C) 6.71 × 1010 m/s2 in the direction of the electric field D) 67.1 × 1010 m/s2 opposite to the electric field E) 67.1 × 1010 m/s2 in the direction of the electric field
For objects the size of baseballs, cars, and airplanes, an uncertainty in momentum of magnitude only one percent yields a limiting uncertainty in position that
A) is also one percent. B) is so small as to be unmeasurable. C) is quite large. D) does not exist. E) is 50%.
What is the ratio of the relativistic momentum to the classical momentum?
a. 
b. 
c. 
d. 
e. 