Converting Units: A Beginner's Guide

  • Thread starter Thread starter lb beatz
  • Start date Start date
  • Tags Tags
    Units
AI Thread Summary
Unit conversion, particularly in physics, often requires understanding the specific definitions of units like electronvolts (eV) without relying on joules for explanation. Participants emphasize the importance of attempting a solution before seeking help, as this fosters learning and clarifies misunderstandings. Hints and guidance are offered rather than complete solutions to encourage independent problem-solving. The discussion highlights the relevance of equations in unit conversion processes. Understanding the context and definitions of units is crucial for successful conversions.
lb beatz
Messages
1
Reaction score
0
Homework Statement
Suppose that certain food was irradiated with an electron beam of kinetic energy 10 MeV. (a) What is the voltage needed for an 'electron gun' to give this kinetic energy to an electron from rest?
Relevant Equations
E = 10 MeV ---> transform to joule

E = e.U ---> ddp ( voltage)
How can I be doing this conversion, could someone explain to me?
 
Physics news on Phys.org
Welcome to Physics Forums :welcome:

We can't provide the full solution for your homework, however we can provide you with hints towards the solution and warn you where you go wrong, provided that you write some attempt for the solution with a post of yours.

You don't have to transform the energy to joules to answer this.

Your second equation is quite relevant. Do you know how the unit of eV is defined? (don't give me a definition through the unit of Joule)
 
Reply
  • Like
Likes Keith_McClary and Orodruin

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Conversion factor when converting from SI to natural units
Replies
1
Views
844
The behaviour of an uncharged dielectric particle in a capacitor
Replies
2
Views
1K
How Can I Solve Question Type: "With Magnitude and Unit Vectors"?
Replies
14
Views
2K
Question in Thermal Physics (Van der Waals' Equation)
Replies
6
Views
3K
I Unit Conversions of Force: How to Convert Between Different Units of Force?
Replies
4
Views
1K
Convert J/mol k into atm cm^3/mol k
Replies
6
Views
7K
Question about this unit conversion principle (multiplying by "1")
Replies
16
Views
2K
Can Mixed Units in Ratios Be Converted and Used Accurately in Calculations?
Replies
6
Views
1K
Unit conversions involving Pascals
2
Replies
67
Views
6K
Writing a vector parallel and normal to a unit vector ##\hat n##
Replies
26
Views
1K

Hot Threads

Recent Insights

Back
Top