Nuclear Binding Energy: A summary of the nuclear reactions that power our sun is 4p ? 4He + 2e-, with masses of 938.272 MeV/c2 for a proton, 3727.38 MeV/c2 for the helium nucleus, and 0.511 MeV/c2 for each electron. How much energy is released by each of these reactions?
A. 24.69 MeV
B. 28.3 MeV
C. 2790.13 MeV
D. 279.01 MeV
Answer: A
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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).
What parameters do Hubble's Law relate to each other?
A.) Galaxy rotation speed and luminosity. B.) Galaxy classification and mass. C.) Cepheid star period and luminosity. D.) Galaxy recession velocity and distance. E.) Galaxy mass and distance.
The water hole lies between 18 and 21 cm in wavelength in the radio spectrum
Indicate whether the statement is true or false
The force exerted on a current-carrying wire located in an external magnetic field is directly proportional to which of the following?
a. field strength c. both A and B b. current strength d. None of the above are valid.