The lifetime of an excited nuclear state is 10-9 s. What is the minimum uncertainty in the energy of this state?
A) 1 × 10-9 eV
B) 1 × 10-25 eV
C) 6 × 10-25 eV
D) 5 × 10-9 eV
E) 7 × 10-7 eV
E
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Heisenberg is especially noted for his
A) wave equation. B) improved periodic table. C) dirigible. D) uncertainty principle. E) photoelectric theory.
Originally 2.00 mol of gas are at STP. If the temperature changes to 47.0°C and the pressure decreases to half of what it was, how many liters do the two moles now occupy? (1 atm = 101 kPa, R = 8.31 J/mol ? K)
What will be an ideal response?
An ideal polarizer with its transmission axis rotated 30° to the vertical is placed in a beam of unpolarized light of intensity 10 W/m2. After passing through the polarizer, what is intensity of the beam?
A) 2.5 W/m2 B) 5.0 W/m2 C) 8.7 W/m2 D) 7.5 W/m2 E) 10 W/m2
A bar of diameter d 5 18 mm and length L 5 0.75 m is loaded in tension by forces P. The bar has modulus E 5 45 GPa and allowable normal stress of 180 MPa. The elongation of the bar must not exceed 2.7 mm. The allowable value of forces P is approximately:
(A) 41 kN
(B) 46 kN
(C) 56 kN
(D) 63 kN
