Home
Class 11
PHYSICS
Describe the measurement of Earth's shad...

Describe the measurement of Earth's shadow (umbra) radius during total lunar eclipse.

Text Solution

Verified by Experts

(i) It is possible to measure the radius of shawdow of the Earth at the point where the Moon crosses.
(ii) When the Moon is inside the umbra shadow, it appears red in colour. As soon as the Moon exits from the umbra shadow, it appears in crescent shape.
(iii) By finding the apparent radii of the Earth's Umbra shadow and the Moon, the ratio of the these radii can be calculated. This is shown in figure.

(iv) Schematic diagram of umbra disk radius. The apparent radius of Earth's umbra shadow = `R_(S) = 13.2 cm`
The apparent radius of the Moon = `R_(m) = 5.15 cm`
(v) The ratio `(R_s)/(R_m) = 2.56`
The radius of the Earth's umbra shadow is
`R_(s) = 2.56 xx R_(m)`.
Promotional Banner

Topper's Solved these Questions

  • GRAVITATION

    SURA PUBLICATION|Exercise EXERCISE - CONCEPTUAL QUESTIONS|8 Videos

  • GRAVITATION

    SURA PUBLICATION|Exercise EXERCISE - NUMERICAL PROBLEMS|15 Videos

  • GRAVITATION

    SURA PUBLICATION|Exercise EXERCISE - SHORT ANSWER QUESTIONS|15 Videos

  • GOVT. MODEL QUESTION PAPER - 2

    SURA PUBLICATION|Exercise PART - IV (Answer the questions)|12 Videos

  • HEAT AND THERMODYNAMICS

    SURA PUBLICATION|Exercise Value Based Question|1 Videos

Similar Questions

Explore conceptually related problems

The radius of the Earth was measured by

A silver ball of radius 4.8 cm is suspended by a thread in a vacuum chamber, Ultraviolet light of wavelength 200nm is incident on the ball for some time during which a total light energy of 1.0 xx 10^-7 J falls on the surface. Assuming that on the average one photon out of every ten thousand is able to eject a photoelectron, find the electric potential at the surface of the ball assuming zero potential at infinity. What is the potential at the centre of the ball?

Draw and describe the total water on earth by pie chart.

A satellite of mass m is orbiting the earth (of radius R) at a height h from its surface. T he total energy of the satellite in terms of g_0 ,the value of acceleration due to gravity at the earth 's surface ,is

A satellite is revolving in a stable orbit of radius r with orbital velocity v_(0) around the earth. The time period of the satellite is T, angular momentum L and its total energy is E. Then which one of the following statement is not correct?

A satellite moves in a circle around the Earth, the radius of this circle is equal to one half of the radius of the Moon's orbit. The satellite completes one revolution in ........ lunar month.

The weight of a body is measured on planet Earth as M . When it is taken to a planet of radius half that of the Earth then its value will be ___________ .