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3316Decay of the First Sine ModeFor the heat equation u t=1u xx on 0<x< with zero boundary conditions, the initial condition is u(x,0)=\sin(1x). What is u(x,t)?数学中等derivation未尝试面试订阅3321Two-Mode Initial ConditionFor u t=1u xx on 0<x< with zero boundary conditions and initial condition u(x,0)=1\sin(1x)+2\sin(2x), write u(x,t).数学中等derivation未尝试面试订阅3323Three-Mode Heat ProfileFor u t=1u xx on 0<x< with zero boundary conditions and initial condition u(x,0)=2\sin(1x)+1\sin(2x)+1\sin(3x), write u(x,t).数学中等derivation未尝试面试订阅3325Alternating Signs in Initial HeatFor u t=1u xx on 0<x< with zero boundary conditions and initial condition u(x,0)=1\sin(1x)-2\sin(2x), write u(x,t).数学中等derivation未尝试面试订阅3331Which Fourier Mode Decays More Slowly?Under the heat equation on 0<x< , which survives longer: the mode \sin x or the mode \sin(3x)?数学中等derivation未尝试面试订阅3332Relative Decay of the Second Mode to the FirstIf two heat modes start with the same amplitude, \sin x and \sin(2x), what multiplicative factor relates the amplitude of the second to the first after time t?数学中等derivation未尝试面试订阅3333Same Mode, Larger Diffusion CoefficientFor the same initial mode \sin(2x), which system cools faster: \kappa=1 or \kappa=3?数学中等derivation未尝试面试订阅3334Long-Run Dominant Mode in a Two-Mode MixtureIf the initial condition is u(x,0)=5\sin x+\sin(4x) with zero boundary conditions, which mode dominates at long horizons?数学中等derivation未尝试面试订阅3335Time Needed for a Mode to Shrink by a Factor e^-1For the mode \sin(3x) evolving under u t=2u xx , after what time does its amplitude shrink by a factor of e -1 ?数学中等derivation未尝试面试订阅3336Why High-Frequency Modes Die FirstWhy does the heat equation smooth out small-scale wiggles faster than large-scale structure?数学中等essay未尝试面试订阅3337Maximum Principle IntuitionWhy can the heat equation not spontaneously create a new interior maximum if there is no internal heat source?数学中等essay未尝试面试订阅3338Boundary Conditions MatterWhy do boundary conditions qualitatively matter for heat diffusion on a finite interval?数学中等essay未尝试面试订阅3339Diffusion as Local AveragingExplain in words why the heat equation can be viewed as repeated local averaging.数学中等essay未尝试面试订阅3340Why Diffusion Forgets Fine Initial DetailsWhy does long-time heat evolution remember coarse mass distribution more than fine initial details?数学中等essay未尝试面试订阅