Use the drop-down menus to complete each sentence. before starting the simulation and having the waves encounter the barrier, the wavelength is manipulated. this is the variable. the pattern of diffraction will vary as a result of the change in wavelength. the diffraction angle is therefore the variable. a "constant" is a parameter that stays the same regardless of the variables. the parameter of the barrier that is held constant is the .

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.