Author Question: The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm. The ... (Read 161 times)

vinney12 · **on:** Jul 29, 2018

The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 10-6 m.

The toaster is designed to operate at a voltage of 120 V. How much power does it draw in normal operation?
A) 370 W
B) 360 W
C) 380 W
D) 400 W
E) 410 W

Question 2

A coating is being applied to reduce the reflectivity of a pane of glass to light with a frequency of 5.75 1014 Hz that is incident normally on the pane.

If the material has an index of refraction of 1.375 and the glass has an index of refraction of 1.537, what is the minimum thickness the coating should have? (c = 3.00 108 m/s)
A) 60.0 nm B) 80.1 nm C) 65.2 nm D) 145 nm E) 94.9 nm

mcomstock09 · **Reply #1 on:** Jul 29, 2018

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