Question

How thick is the photosphere of the Sun?
(A) $500km$
(B) $5000km$
(C) $50km$
(D) $5km$

Answer 1

Hint: The lowest or the deepest layer of the Sun is the photosphere. This layer is the thinnest layer which is around three hundred miles. Here, we are given multiple options in kilometres so will find the equivalent thickness.

Complete answer:
The three layers of the atmosphere of the Sun are –
-Photosphere
-Chromosphere
-Corona
The innermost layer is the photosphere which can be seen easily which burns at $5800$K. The photosphere is the opaque to light which allows only transferred energy from the convection layer.
The photosphere is the lowest layer of the Sun which can be observed directly and it reaches from the surface which is visible at the center of the solar disk.
Hence from the given multiple choices, the option A is the correct answer.

Note:
Remember the thickness of the photosphere learnt by heart. Don’t get confused between the terms. The Chromosphere is known as the sphere of color and this layer is as dense as the photosphere whereas, the Corona is the outer layer which is very dim and million times dimmer than the photosphere and it is the hottest.