A heater is rated at 1200 watts for a 120-volt source.The current drawn by the heater is 10 amperes
a. True
b. False
Indicate whether the statement is true or false
True
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Plane polarized light of intensity 
is sent through a polarizer rotated 45
clockwise to the original plane of polarization and then through a second polarizer rotated 45 
counter-clockwise measured from the original plane of polarization. What is the transmitted intensity?
A. 0.71 
B. 0.50
C. 0.35
D. 0.25
E. 0
Many of the mechanical applications of copper alloys are due to high thermal conductivity and excellent _________resistance.
Fill in the blank(s) with the appropriate word(s).
Neutron stars do NOT have:
A) masses greater than 1.4 solar masses. B) sizes comparable to large cities. C) strong magnetic fields. D) large surface gravities, compared to the Sun. E) rotation periods comparable to the Sun's.
In air a light source emits a wavelength of 630 nm. Under water the wavelength of this light will be
a. 630 nm. b. less than 630 nm. c. more than 630 nm. d. unpredictable.