Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

The metre is defined as the distance travelled by light in 1/299729458 second. Why didn't people choose some easier number such as 1/300000000 second ? Why not 1 second ?
Asked by Veneet Suri | 29 Apr, 2013, 10:33: PM
answered-by-expert Expert Answer
Because speed of  light  is a constant quantity and it remains unchanged wrt any other frame of reference.
Exact speed of light is 299729458m/s.You can take it as 300000000m/s but the measure will not be accurate.
Answered by | 30 Apr, 2013, 11:37: AM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 11-science - Physics
the dimension of stopping potential vo in photoelectric effect in units of plank's constant 'h',speed of light 'c' and gravitational constant 'G' and ampereA
Asked by derhebha955 | 03 Apr, 2024, 09:03: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
In this que while solving it we take D F of alpha =D.F of beta.Why is it so?
question image
Asked by sumedhasingh238 | 29 Mar, 2024, 05:15: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
In physics if 2 quantities are dimensionless then their dimensional formula are equal?
Asked by sumedhasingh238 | 28 Mar, 2024, 11:10: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
Power unit
Asked by rosysahu678 | 02 Mar, 2024, 06:09: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
frequency of vibration (n) of a stretched string depends on its length (l) , tension (t) and linear mass density taking proportionality constant k=½ find a relation between them
Asked by ss4172380 | 14 Nov, 2023, 08:05: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
Calculate the wave number of a wave with a frequency of 6.2 *10^7
Asked by doddisriman | 29 Oct, 2023, 09:43: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
name to fundamental forces in nature
question image
Asked by sanketnaik338 | 04 Oct, 2023, 09:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
Calculate the angle of (a) , 1°(b) 1`(minute of arc or arcmin) and (c) 1``(second of arc second) in radius. Use 360°=2π rad, 1°=60` and 1`=60``.
Asked by mayankvaram96 | 01 Oct, 2023, 06:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
The respective number of significant figures for the numbers 23.023; 0.0003 and 2.1´10-3 are (a) 4, 4, 2                     (b) 5, 1, 2                     (c) 5, 1, 5                     (d) 5, 5, 2
Asked by Naveensharma2007 | 26 Jun, 2023, 06:54: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Physics
if the momentum of body decreases by 30% its kinetic energy decreased by
question image
Asked by bhargavchary19 | 23 Dec, 2022, 07:33: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×