Use app×
Ask a Question
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE

The rest energy of an electron is.

← Prev Question Next Question →
0 votes
68 views
in Physics by (72.6k points)
closed by
The rest energy of an electron is.
A. `510 KeV`
B. `931 KeV`
C. `510 MeV`
D. `931 MeV`
Play Quiz Games with your School Friends. Click Here

1 Answer

0 votes
by (118k points)
selected by
 
Best answer
Correct Answer - A
(a) Rest energy of an electron `= m_e c^2`
Here, `m_e = 9.1 xx 10^-31 kg` and `c =` velocity of light
`:.` Rest energy `= 9.1 xx 10^-31 xx (3 xx 10^8)^2` Joule
`=(9.1 xx 10^-31 xx (3 xx 10^8)^2)/(1.6 xx 10^-19) eV = 510 keV`.
← Prev Question Next Question →

Find MCQs & Mock Test

  1. JEE Main 2025 Test Series
  2. NEET Test Series
  3. Class 12 Chapterwise MCQ Test
  4. Class 11 Chapterwise Practice Test
  5. Class 10 Chapterwise MCQ Test
  6. Class 9 Chapterwise MCQ Test
  7. Class 8 Chapterwise MCQ Test
  8. Class 7 Chapterwise MCQ Test

No related questions found

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

User Contribution to Sarthaks eConnect
Managed by Sarthaks Digitizing India
...