This topic contains a solution. Click here to go to the answer

Author Question: An energy of 13.6 eV is needed to ionize an electron from the ground state of a hydrogen atom. ... (Read 153 times)

biggirl4568

  • Hero Member
  • *****
  • Posts: 551
An energy of 13.6 eV is needed to ionize an electron from the ground state of a hydrogen atom. Selecting the longest wavelength that will work from the those given below, what wavelength is needed if a photon accomplishes this task?
 a. 60 nm
  b. 80 nm
  c. 70 nm
  d. 90 nm
  e. 40 nm

Question 2

Carla and Jenny are arguing about whether or not it is possible to escape the gravitational field of the Earth. Carla shows Jenny a system where mass m is rE (not the Earth's radius) distant from Earth and rP (not planet P's radius) distant from planet P, the mass being on the line connecting the Earth and planet P. Carla states that the mass m has escaped if FP on m = -FE on m. Jenny disagrees. Which one, if either, is correct, and why?
 a. Carla, because the total gravitational force on m is zero at that point.
  b. Carla, because there is no gravitational force from Earth on m at that point.
  c. Carla, because there is no gravitational force on m from Earth when r > rE.
  d. Jenny, because there is a gravitational force on m from Earth no matter how great the distance from the Earth.
  e. Jenny, because the gravitational force from the Earth can only be blocked by a body that is larger than the Earth.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

jordangronback

  • Sr. Member
  • ****
  • Posts: 339
Answer to Question 1

D

Answer to Question 2

D





 

Did you know?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

Did you know?

Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

Did you know?

In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

Did you know?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

For a complete list of videos, visit our video library