The following are the impulse responses of discrete-time LTI systems. Determine whether each system is causal and/or stable. Justify your answer a.  h[n]=(1/5)nu[n]h[n]=(1/5)^n u[n]

b. h[n]=(0.8)nu[n+2]

c. h[n]=(½)nu[−n]

d. h[n]=(5)nu[3−n]

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?