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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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
Heisenberg is especially noted for his
A) wave equation. B) improved periodic table. C) dirigible. D) uncertainty principle. E) photoelectric theory.
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
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?