The excited state of a certain atom is 3.2 eV ± 0.21 eV. (h = 6.626 × 10-34 J ? s, 1eV = 1.60 × 10-19 J)

(a) What is the average lifetime of this state, in femtoseconds?
(b) If the excited energy were doubled (to 6.4 eV ± 0.21 eV), how would the lifetime be affected?


(a) 3.1 fs (b) unchanged since the uncertainty is still ± 0.21 eV

Physics & Space Science

You might also like to view...

When lying down, the gauge pressure of the blood at a patient's heart is 13.3 kPa. If the patient suddenly stands up and her body doesn't compensate quickly enough for the pressure changes, what would be the pressure at her head, 55.0 cm above her heart? The density of blood is 1 060 kg/m3

a. 7.59E+3 Pa b. 5.71E+3 Pa c. 1.90E+4 Pa d. 5.85E+5 Pa

Physics & Space Science

The prime meridian (where longitude equals zero) passes through:

A. Paris. B. Beijing. C. New York. D. Greenwich.

Physics & Space Science

Light in air enters a diamond (n = 2.42) at an angle of incidence of 30.0°. What is the angle of refraction inside the diamond?

a. 11.9° b. 4.90° c. 0.208° d. 24.1° e. 30.0°

Physics & Space Science

Neptune circles the Sun at a distance of 4.50 × 1012 m once every 164 years. Saturn circles the Sun at a distance of 1.43 × 1012 m. What is the orbital period of Saturn?

A) 304 years B) 121 years C) 109 years D) 88.6 years E) 29.4 years

Physics & Space Science