When unpolarized light from air (with refractive index 1.00 ) strikes a piece of glass with index of refraction 1.80,
the reflected light is found to be completely polarized when the angle of incidence is equal to Brewster's angle. What is the angle of refraction in this case?
29.1°
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Which of the following is least reasonable regarding cosmic background radiation (CBR)?
A) CBR correponds to a solar temperature of about 6,000 degrees and implies that the B) The original CBR corresponded to a much higher temperature, but the expansion of C) Satellite-based telescopes were crucial to the discovery of CBR because much of the D) The motion of the Earth produces a Doppler shift, which causes CBR to appear a little E) Data for CBR is collected by pointing telescopes into dark regions of the sky (that do not appear to have any bright objects).
The universe was two minutes old when ________ started to form from deuterium fusion
Fill in the blank(s) with correct word
A circular loop carrying a current of 3.0 A is oriented in a magnetic field of 0.35 T. The loop has an area of 0.24 m2 and is mounted on an axis, perpendicular to the magnetic field, which allows the loop to rotate. What is the torque on the loop when its plane is oriented at a 50° angle to the field?
a. 4.6 N×m c. 0.076 N×m b. 0.16 N×m d. 0.23 N×m
A device that measures absolute air pressure is called a
a. manometer b. barometer c. thermometer d. tire gauge e. none of the above