Question
Download Solution PDFWhat is the unit of solid angle?
This question was previously asked in
RPF Constable (2018) Official Paper (Held On: 02 Feb 2019)
Answer (Detailed Solution Below)
Option 3 : Stereadian
Free Tests
View all Free tests >
RPF Constable Full Test 1
3.9 Lakh Users
120 Questions
120 Marks
90 Mins
Detailed Solution
Download Solution PDFThe correct answer is Option 3.
Key Points
- The unit of solid angle is the steradian (sr).
- One steradian is defined as the solid angle that, from a point, subtends an area on the surface of a sphere equal to the square of its radius.
- The steradian is a dimensionless unit, and it is used to measure the extent of a three-dimensional angle or the spread of a beam of radiation or light.
- For example, a sphere encloses 4π steradians of solid angle, while a cone with a circular base that subtends an angle of one radian at the apex encloses 1 steradian of solid angle.
Last updated on Jun 2, 2025
-> The Railway Recruitment Board has released the RPF Constable 2025 Response Sheet on 24th March 2025. As per the official notice, the RPF Constable Answer Key will be available from 24th March 2025 to 29th March 2025.
-> The RRB ALP 2025 Notification has been released on the official website.
-> The Examination was held from 2nd March to 18th March 2025. Check the RPF Exam Analysis Live Updates Here.
-> RPF Constable 2025 application status was released in January 20, 2025.