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Q. What are the wave fronts?
Answer:-
(Physics) A wave front is an fantasy surface joining all points in space that are reached at the same instant by a wave propagating through a medium.
Let's try some instances. When a rock is tossed into a calm lake a surface annoyance radiates from the point where the rock broke the water. The leading edge of that whole wave forms a circle and that circle is the wave front for that event. It is moving external at a constant speed in all directions. Note that it is two-dimensional (2D). Want is 3D? You got it.
In a rupture of chemical energy a star shell explodes at a fireworks display. The light moves apart from the origin in all directions at the same speed - the speed of light. In addition to the 3D surface of this wave front is a sphere and it is expands around the origin at the speed of light. Choose an arbitrary distance say 1 kilometre. Anybody at a distance of 1 km from the event in any direction will find that the wave front reaches him at the same instant of time as anyone else in any direction who is that 1 km from the event. Even somebody in an airplane that is 1 km away will be on the wave front for an instant - that similar instant as any other observers 1 km away. Note that the sound will reach later - but it too radiates forming a spherical wave front. Our spectators at 1 km distance from the event all experience the arrival of the sound wave at the same time.
Q. What's the way of the force if exerted on charged particle? Described below is a positively charged particle in a rightward-directed electric field. The particle has a veloc
Which of the following material has the highest melting point (A) Copper. (B) Aluminium. (C) Tungsten. (D) Gold. Ans: Tungsten has the highest melting point.
a spacecraft is moving relative to the earth. an observer finds that according to her clock 3601 seconds elapse between 1pm and 2pm on the spacecrafts clock. what is the spacecraft
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