Answer:
1.08
Explanation:
This is the case of interference in thin films in which interference bands are formed due to constructive interference of two reflected light waves , one from upper layer and the other from lower layer . If t be the thickness and μ be the refractive index then
path difference created will be 2μ t.
For light coming from rarer to denser medium , a phase change of π occurs additionally after reflection from denser medium, here, two times, once from upper layer and then from the lower layer , so for constructive interference
path diff = nλ , for minimum t , n =1
path diff = λ
2μ t. = λ
μ = λ / 2t
= 626 / 2 x 290
= 1.08
Answer:
By plotting the locations of earthquakes
Explanation:
When plotting the locations of earthquakes, scientists have been able to locate plate boundaries and also be able to determine plate characteristics and predict the movement of plates
-Planets orbiting the sun
- Meteors being pulled into a planet's atmosphere
Answer: B
The immense volume of matter
Explanation:
Stars are formed by cloud and dust, draw together by gravity.
But the longevity of a main sequence star lives depends on how massive it is. An enormous massive star burns faster due to its enormous material it contains and higher core temperatures caused by greater gravitational forces. While a less massive star will burn slowly and stick around the sun for a very long period. The structure of a main sequence star like our sun can therefore hold for a long time because of the immense volume of matter of star.
Answer:
Explanation:
According to newton's law of gravitation , equal force of attraction are applied on two masses m₁ and m₂ placed at distance d . This force is given by the expression
F = G m₁ m₂ / d²
If one of the masses be earth with mass M then d = radius of earth R
Force F = G Mm₁ / R²
this force is applied on both the earth and mass m₁ in equal magnitude and in opposite direction.
In the formula F is proportional to m₁
among the given objects in the question , m₁ of object varies in the following order.
skyscraper > car > human being > basket ball
So Force F on the earth by them will also vary in the same order.
