Question

give answer any three now fast​

Answer 1

Answer:

Answer 1

A device used for heat measurement is called a calorimeter. It consists of a metallic vessel and stirrers. ... The vessel is then kept inside a wooden jacket which contains heat-insulating materials. The outer wooden jacket acts as a heat shield and reduces the heat loss from the inner vessel

Answer 2

The total number of waves produced in one second is called the frequency of the wave. The number of vibrations counted per second is called frequency. Here is a simple example: If five complete waves are produced in one second then the frequency of the waves will be 5 hertz (Hz) or 5 cycles per second.

Answer 3

The law of reflection states that the angle of reflection equals the angle of incidence—θr = θi. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface.