PHYS 210 Final, Spring 2008

Marks: 4 Monochromatic light is used in a single-slit diffraction experiment. The slit width is a=0.14 mm, the distance to the screen is L=1.16 m and the width of the central maximum is 4.6 mm. What is the wave length of light?. Small angle approximation is valid here. The answer in in nanometer (nm). Choose one answer. Incorrect Marks for this submission: 0/4. a. 564nm x b.323nm x c. 277 nm ¥ d.139nm x e. 589nm x 10 @A 2.0-kg block is projected down a plane that makes an angle of 20° with the horizontal with an initial kinetic energy of Marks: 4 2.0 J. If the coefficient of kinetic friction between the block and plane is 0.40, how far will the block slide down the plane before coming to rest?. Take g=9.8 mis? . Recommended: Use energy conservation. Choose one answer a. 140m x b.1.0m x ¢.0.30m x ® 430m¥ e18m x Correct Marks for this submission: 4/4 1 Marks: 4 @Two blocks marked 1 and 2 in the Figure have the same mass m=2.0 kg. The coefficients of kinetic friction between the blocks and the surface are My =0.2 and H=0.65, where Uy > Wy: What is the angle OF in degrees at which the blocks slide down with constant velocity? . NO UNITS NEEDED. Put 2 figures after the decimal point Answer: 23.02 Correct Marks for this submission: 4/4 12 @A 1.5-kg object has a velocity of 5j m/s at t= 0. It is accelerated at a constant rate for five seconds after which it has Sed ES) a velocity of (6i + 12j) m/s. What is the magnitude of the resultant force acting on the object during this time interval?. Note that the boldface letters are unit vectors. Choose one answer. a43N x b.3.8N x c.46N x d.3.1N x e28N ¥ Correct Marks for this submission: 4/4. B @A soap bubble (n = 1.35) is floating in air. If the thickness of the bubble wall is t=124.8 nm, what is the wavelength hehe most strongly (m=0) reflected? YOUR ANSWER IN nanometer and 2 figures after the decimal point Answer: 673.92 Correct Marks for this submission: 4/4 14 Marks: 4 @A double slit has a spacing d=0.15 mm and is illuminated by a sodium lamp which produces a bright yellow light of wavelength ,=589 nm. How far from the slits should be a screen placed to observe bright fringes that are separated by 10 mm? Choose one answer. a.127m x © b.255m ¥ c.0.63m x d.1.60m x e.5.08m x Correct Marks for this submission: 4/4 15 Marks: 4 © Monochromatic light with a wavelength A=713 nm (nm=nanometer=1.0x10" 9 m) is used in a double-slit experiment in which the slit spacing is d=0.14 mm and the distance between the slits and the screen is L=0.96 m. What is the distance between the central maximum and the m=3 minimum? Choose one answer. Incorrect Marks for this submission: 0/4 a. 34mm * b. 1.7mm x c.17mm ¥ d.7.3mm x e.12mm x 16 Marks: 4 @After diving in a swimming pool in the night, you discover that you lost your key in the pool. You then find a flashlight to locate the key on the bottom of the pool. You succeed to find the key when the flashlight is held 1.2 m above the water surface and is directed at the water surface a horizontal distance of 1.5 m from the edge (see Figure below). How far is the key from the edge of the pool, (that is find x) ?. Refraction indes of water is tel SS) It is a kind of mental training: Phys 210 helps you to find the key in the wimming pool in the night. 40m Choose one answer. a88m x b. 180m * @ c44m¥ d.22m x e.160m x Correct Marks for this submission: 4/4 17 Marks: 4 Water (density=1000 kg/m?) is flowing smoothly through a closed pipe system. At one point (ground), the speed is vy 2 =4.0 m/s. If the pressure at point 1 is P, =20 kPa (kPa=1000 pa, pa=1.0 Nim?), what is the pressure at point 2?. g=9.8 m/s? . GIVE YOUR ANSWER in Kpa with 1 figure after the decimal point. NO UNITS WITH THE ANSWER =3.0 m/s , while at other point at a height h=0.79 m, the speed is v Answer: 8.76 Correct Marks for this submission: 4/4 18 @An ideal monatomic gas of 1.8 moles undergoes the process shown in the Figure below. What is the temperature a7 change during this process? . Choose one answer: (1) (200 to 300) K (2) (200 to 333) K B) (300 to 500) K (4) (200 to 500) K (5) (300 to 600) K 0.03 0.05 Choose one answer. a.(1) x b. (5) x c. (3) x d. (2) x e. (4) ¥ Correct Marks for this submission: 4/4