Whenever water condenses,
A) heat is absorbed.
B) heat is released.
C) frost forms.
D) temperature drops.
Answer: A
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The protons and neutrons that make up normal matter belong to a family of subatomic particles called _____
A) embryons B) tachyons C) rayons D) baryons
An object is placed 10 cm in front of a concave mirror with a 20-cm focal length. Determine the image location (in cm)
a. -20 b. -15 c. -10 d. -5 e. 6.7
Optical fibers work because of __________
Fill in the blank(s) with correct word
Only 10% of the energy dissipated by the tungsten filament of an incandescent lamp is in the form of useful visible light. Consider a 100 W lamp with a 10 cm spherical glass bulb. Assuming an emissivity of 0.85 for the glass and ambient air temperature of 20°C, what is the temperature of the glass bulb?
GIVEN
• A spherical glass light bulb in air
• Bulb power consumption (P) = 100 W
• 10% of energy is in the form of visible light
• Diameter (D) = 10 cm = 0.1 m
• Bulb emissivity (?) = 0.85
• Ambient temperature (T?) = 20°C = 293 K
FIND
• The temperature of the glass bulb (Ts)
ASSUMPTIONS
• Ambient air is till
• The bulb has reached steady state
• The surrounding behave as a black body at T?
SKETCH
PROPERTIES AND CONSTANTS
Boltzmann constant (?) = 5.7 × 10–8 W/(m2 K4).