 So, just to honor the frequency, typically the at least kilohertz velocity, 2.1, it is okay, just one single is at this point, maximum amount, the particle of the medium can have. Okay, so this is, this is the, so whatever the maximum possible, so this much is the amplitude, capital A it gets represented by, and the assignment is the rate, the rate of energy transfer by the wave will be more, the energy from the wave. So, there you which you have studied inside, power you get the energy, isn't it? This assignment means power only, that is joule per second, with respect to time, rate at which energy gets transferred is the, see there is a formula that you learn in 11, that intensity is proportional to frequency square and amplitude square. Okay, there is velocity of wave also coming in the equation, but we are not getting all that, okay, not amplitude, amplitude square, if we double the amplitude, energy becomes 4 times, okay, but let's not get into that. Power is transmitted, fine, now let's talk about sun image E M wave, it reaches earth, okay, do you get energy per minute times sun image or how much energy per minute time earth gets? How much is the power for 1 meter square area? You are not getting it, okay, example of sun, so this is sun, it emits distributed, how do you, I mean do you know this? Yeah, and a spherical radial symmetry, so earth is this much, you can't see the earth, so it is quite big which I have done, fine, so the wave, if you drop earth is much radius, which is the distance of earth from the sun, you are intact, okay, so let's say sun can on which that area more than 8, so the power we got it now, so this you are not going to get asked question on this, I am just telling this so that you understand the significance of power per minute area, rather than just knowing power, if I tell you, okay, power intake by sun is this much, that doesn't mean anything to you, you might be setting intensity, fine, so more power than the sun, more power than what no one would ask you, yeah, it is, total power, you will see more thing, but power per, power is proportional to amplitude square, just for amplitude square time, if you double the m, 4 times, not just sound, statistics which are specific to the sound, only with respect to sound they have different state.