Ask a Doubt
Request a call back

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

CBSE Class 10 Answered

twinkling
Asked by Manishjyani67 | 23 Oct, 2020, 09:00: AM
answered-by-expert Expert Answer
The twinkling of a star is due to atmospheric refraction of star light. The starlight, on entering the earth’s atmosphere,
undergoes refraction continuously before it reaches the earth.The atmospheric refraction occurs in a medium of gradually
changing refractive index. Since the atmosphere bends starlight towards the normal, the apparent position of thestar is
slightly different from its actual position. The star appears slightly higher (above) than its actual position when viewed
near the horizon (refer Figure).
Further, this apparentposition of the star is not stationary, but keeps on changing slightly, since the physical conditions
of the earth’satmosphere are not stationary. Since the stars are very distant, they approximate point-sized sources of light.
As the path of rays of light coming from the star goes on varying slightly, the apparent position of the star fluctuates and the amount of
star light entering the eye flickers – the star sometimes appears brighter,and at some other time, fainter, which is the twinkling effect.
Answered by Thiyagarajan K | 23 Oct, 2020, 09:53: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Physics
Will a current carrying conductor produce an electric field?
Asked by saanviyadla | 24 Jan, 2024, 07:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
if one microampere current flows through a conductor for 10 seconds how many electrons will pass at the point of cross section
Asked by ruparus | 03 Nov, 2022, 10:02: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
In a household five tube lights of 40 volt each are used for 5 hours and electric press of 500 volt for 4 hours everyday. Calculate the total energy consumed by the tubelight and press in a month of 30 days
Asked by ksheluka41 | 03 Nov, 2022, 05:33: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
what is volt
Asked by dagurankur03 | 08 Apr, 2022, 09:56: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
why does need to maintain the current in a given electric circuit by expanding its energy stored in it?
Asked by ragavarshinik07 | 30 Mar, 2022, 07:17: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
The flow of electrons is opposite to the direction of the flow of current as electron is negatively charged . Then why current is defined as the flow of electrons through the conductor though current travels from positive to negative terminal.
Asked by suneethasri83 | 01 Jan, 2022, 02:59: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
If charge on one electron is 1.6 x 10 -19 C. Calculate number of electrons required to constitute 1A of current in 1s.
Asked by shashankkatekar | 28 Dec, 2021, 07:26: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
what is the power of torch bulb rated at 2.5V and 500 mA?
Asked by sunilgupta9419158173 | 20 Jul, 2021, 01:14: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
The MCB of a Rupa’s room is tripped and keeps on tripping again and again. If it is a domestic circuit, what could be the reason of this phenomenon?
Asked by swatipuspapatel | 08 Jul, 2021, 04:36: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
a current
question image
Asked by mdasifannu | 04 Jul, 2021, 10:37: 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
×