Answer:
Explanation:
height of Ellipse
i.e.
Width of Ellipse 
i.e.
Equation of a vertical Ellipse is
at
Answer:

Explanation:
We are given that


d=1.9 cm=
Using 1m=100 cm
We have to find the electric field strength.

Using the formula





Mass of electron,m

Substitute the values


Answer:
A
Explanation:
Begin as protostars, which fire up when they collapse and become denser and hotter.
Answer:
When light enters from air to water i.e. it is moving from rarer to denser medium, it changes its original path as there is a change of speed of light and deflects itself towards the normal. This is known as the refraction of light and this is why a pencil in a cup of water looks as if it is broken and larger.
Explanation:
Answer:
377 nm
Explanation:
Number of lines per meter is,
Grating element is,