This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: When a photoelectric surface is illuminated with light of wavelength 437 nm, the stopping potential ... (Read 93 times)

audie

  • Hero Member
  • *****
  • Posts: 532
on: Jul 29, 2018
When a photoelectric surface is illuminated with light of wavelength 437 nm, the stopping potential is measured to be 1.67 V.
 
  (1 eV = 1.60  10-19 J, e = 1.60  10-19 C, melectron = 9.11  10-31 kg, h = 6.626  10-34 J  s)
  (a) What is the work function of the metal, in eV?
  (b) What is the maximum speed of the ejected electrons?

Question 2

A tiny 0.0250-g oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces.
 
  The plates are both circular with a radius of 6.50 cm. (k = 1/40 = 9.0  109 N  m2/C2, e = 1.6  10-19 C)
  (a) How much excess charge must be on each plate to hold the oil drop steady?
  (b) Which plate must be positive, the upper one or the lower one?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Cnarkel

  • Sr. Member
  • ****
  • Posts: 339
Reply #1 on: Jul 29, 2018
Answer to Question 1

(a) 1.17 eV (b) 7.66  105 m/s

Answer to Question 2

(a) 12.0 C (b) upper plate


audie

  • Hero Member
  • *****
  • Posts: 532
Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


Cnarkel

  • Sr. Member
  • ****
  • Posts: 339
Reply #3 on: Jul 29, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Did you know?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Did you know?

Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Light Palpation of Abdomen Light Palpation of Abdomen
The path of light through the cornea, iris, lens, and striking the retina. The path of light through the cornea, iris, lens, and striking the retina.
Major Findings of the High Scope Preschool Study High Scope participants showed better academic per Major Findings of the High Scope Preschool Study High Scope participants showed better academic per
Refractory periods associated with an action potential. Refractory periods associated with an action potential.
When both sides of the back have been massaged, redrape the back. With light to moderate force, use ... When both sides of the back have been massaged, redrape the back. With light to moderate force, use ...
The Ames test, which screens compounds for potential mutagenicity The Ames test, which screens compounds for potential mutagenicity
Video: Major Elements in Biological Molecules: Carbohydrates

For a complete list of videos, visit our video library