Energy Levels: What is the energy of the photon emitted when an electron drops from the n = 20 state to the n = 7 state in a hydrogen atom?
A. 0.244 eV
B. 0.263 eV
C. 0.283 eV
D. 0.302 eV
Answer: A
You might also like to view...
An ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the ambulance is stationary, what is the frequency of the siren perceived by the observer?
A. 2,640 Hz B. 2,559 Hz C. 2,324 Hz D. 2,139 Hz E. 2,003 Hz
What is the Great Red Spot?
A) a long-lived, high-pressure storm on Jupiter B) a hurricane that comes and goes on Jupiter C) a place where reddish particles from Io impact Jupiter's surface D) a region on Jupiter where the temperature is so high that the gas glows with red visible light
Vector is 75.0 cm long and points at 30° above the positive x axis. Vector is 25.0 cm long and points along the negative x axis. Vector is 40.0 cm long and points at 45° below the negative x axis
(a) Determine the x and y components of Vector . (b) Determine the x and y components of Vector . (c) Determine the x and y components of Vector . (d) Determine the sum of these three vectors in terms of components. (e) Determine the sum of these three vectors in terms of magnitude and direction.
Which of the following makes an approximate uniform electric field?
A) a metal charged sphere B) a metal charged cylinder C) a very long line of positive charge D) very large, closely separated, parallel oppositely charged plates E) two long parallel, closely separated, oppositely charged lines of charge