Halla la profundidad a la que se encuentra sumergido un barco en el océano Atlántico si el tiempo que tarda la reflejarse la onda sonora en un sonar es de 1.750 s V del sonido 1530 m/s

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

The least penetrating form of radiation is

Select the correct answer. what does the process of natural selection involve?