The excited state of a certain atom is 3.2 eV ± 0.21 eV
(a) What is the average lifetime of this state?
(b) If the excited energy doubled (6.4 eV ± 0.21 eV) how would the lifetime be affected?
(a) 1.6 fs
(b) unchanged, uncertainty still ± 0.21 eV
You might also like to view...
Power: The figure shows a graph of the power dissipated in a resistor as a function of the resistance. What quantity does the slope of this graph represent?
A. the current in the resistor B. the potential difference across the resistor C. the reciprocal of the current in the resistor D. the square of the current in the resistor E. the resistivity of the resistor
The ratio of the energy of a photon to its frequency is
A) ?. B) Planck's constant. C) photon speed. D) photon wavelength. E) unknown.
One of the main reasons the Hubble Space Telescope was built and launched was to measure how fast the universe is expanding. If the expansion turns out to be faster than we thought, our estimate for the age of the universe will be
A) older (more time between now and the Big Bang). B) younger (less time between now and the Big Bang). C) unaffected.
Three point charges are placed on the x-axis. A charge of +2.0 ?C is placed at the origin, -2.0 ?C to the right at x = 50 cm, and +4.0 ?C at the 100 cm mark
What are the magnitude and direction of the electrostatic force that acts on the charge at the origin? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)