B.False
Einstein's vision of GR is NOT that somehow Gravity comes along and alters (indents?) some existing structure.
It is that Gravity (with its four possible sources) actually determines the entire global structure of Space-Time in which such sources are extant.
1000 m/s
You have the wavelength and frequency, you just need to solve for velocity. You can do this by multiplying each side of the equation by frequency.
Answer:
Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
<u>Answer:</u> The correct statement is True.
<u>Explanation:</u>
There are two types of charges in the electric field:
- Negative charge known as electrons
- Positive charge known as holes
The above two are oppositely charged species and we also know that electric current is the flow of free electrons in a current.
Negative charges (Electrons) flow from the negative terminal to the positive terminal while positive charges (holes) flow from the positive terminal to the negative terminal. Thus, they move in the opposite direction.
Hence, the correct statement is True.
Answer:
The critical angle for the liquid when surrounded by air is 30 degrees.
Explanation:
Given that,
The angle of incidence is 33.5° and the angle of refraction is 19.3°. Firstly, we can find the refractive index of the liquid. It can be calculated using Snell's law as :
The critical angle is given by :
Here, 
is refractive index of air and 
is refractive index of liquid.
So, the critical angle for the liquid when surrounded by air is 30 degrees.
