A person weighting 700 N stands in the middle of an otherwise empty 4 m x 5 m x 3 m room. How does the weight of the person compare with the weight of the air (the density of air is 1.29 kg/m3 ) in the room?
A) The weight of the air is much more than the weight of the person.
B) The weight of the air is about the same as the weight of the person.
C) The weight of the air is much less than the weight of the person.
D) It makes no sense to speak of weight for a gas like air.
B
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In a double slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 100 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point 5 mm from the central maximum when the wavelength is 400 nm? (Convert your result so the angle is between 0 and 360°.)
a. 90° b. 180° c. 270° d. 360° e. 160°
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