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

Author Question: If an electron has a wavelength of 0.123 nm, what is its kinetic energy, in electron-volts? This ... (Read 100 times)

kodithompson

  • Hero Member
  • *****
  • Posts: 566
on: Jul 29, 2018
If an electron has a wavelength of 0.123 nm, what is its kinetic energy, in electron-volts? This energy is not in the relativistic region. (melectron = 9.11  10-31 kg, 1 eV = 1.60  10-19 J, h = 6.626  10-34 J  s)
 
  A) 19.8 eV
  B) 60.2 eV
  C) 80.4 eV
  D) 99.5 eV
  E) 124 eV

Question 2

An ideal transformer with 120 turns in its secondary supplies 12 V at 220 mA to a toy train. The primary is connected across a 120-V wall outlet.
 
  (a) How many turns are in the primary?
  (b) What is the primary current?
  (c) What power is delivered by the wall outlet?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kaillie

  • Sr. Member
  • ****
  • Posts: 326
Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

(a) 1200 (b) 22 Ma (c) 2.6 W


kodithompson

  • Member
  • Posts: 566
Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)

amit

  • Member
  • Posts: 364
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

Did you know?

Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

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?

In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

Did you know?

Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

The Energy Sector The Energy Sector
Tummy rock to release energy blocks in the torso and head. Tummy rock to release energy blocks in the torso and head.
Food choices vs. energy choices Food choices vs. energy choices
Short-wavelength flux is reflected by Earth Short-wavelength flux is reflected by Earth
Humans take in energy by eating food Humans take in energy by eating food
A baseball (1 kg) has an energy of 100 joules. If its uncertainty in position is 1 m, what is ... A baseball (1 kg) has an energy of 100 joules. If its uncertainty in position is 1 m, what is ...
Video: Second Messengers in the Inositol-lipid Signaling Pathway

For a complete list of videos, visit our video library