Answer:
The relation is n = c/v where c is speed of light in a vacuum....v is the speed of light in the new medium ......n is the refractive index of the material
It still has a definite temperature.
Answer
D.Diffraction
Explanation
Diffraction is a property that is experienced by waves when they come across a barrier when they are in motion.
The ways tends to curve behind the barrier. This is called diffraction of waves.
Now, sound is a wave and it also experience diffraction. . So the brother will be able to hear the sound due to diffraction
Answer:
A. Objects 1 and 2 will not move, and objects 3 and 4 will accelerate
upward.
Explanation:
A is correct as the weight in Objects 1, and 2 is greater than the person's push force; however it is on the ground meaning it is at it's stable state meaning the box couldn't be moved downwards anymore. And The newtons in 3 and 4 are the same
B is incorrect as Object 3 and 4 has a less Newton weight than newton force
C is incorrect as Object 1 and 2 has a greater Newton weight than newton force
D is incorrect as Object 1 and 2 wouldn't move downwards
Hope this helps!