At most, how many bright fringes can be formed on each side of the central bright fringe (not counting the central bright fringe) when light of 625 nm falls on a double slit whose spacing is 1.97 × 10-6 m?
A) 1
B) 2
C) 3
D) 4
E) 5
C
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Show that the temperature distribution in a sphere of radius ro, made of a homogeneous material in which energy is released at a uniform rate per unit volume Gq, is
GIVEN
- A homogeneous sphere with energy generation
- Radius = ro
FIND
- Show that the temperature distribution is as shown above.
ASSUMPTIONS
- Steady state conditions persist
- The thermal conductivity of the sphere material is constant
- Conduction occurs in the radial direction only
SKETCH
A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is 2 volts
a. True b. False Indicate whether the statement is true or false
Determine the rate of heat flow per foot length from the inner to the outer surface of the molded insulation in the accompanying sketch. Use k = 0.17 W/( m K).
GIVEN
The object with a cross section as shown in the sketch below
The thermal conductivity (k) = 0.17 W/(m K)
FIND
The rate of heat flow per foot length from the inner to the outer surface (q)
ASSUMPTIONS
The system has reached steady state
The thermal conductivity does not vary with temperature
Two dimensional conduction
SKETCH
Light is reflecting off a wedge-shaped thin piece of glass producing bright and dark interference fringes. If a certain location has a bright fringe, a nearby point will have a dark fringe if the thickness of the glass increases by:
a. 1/8 of a wavelength of the light. b. 1/4 of a wavelength of the light. c. 1/2 of a wavelength of the light. d. one wavelength of the light.