Wave interference occurs for waves of
A) sound.
B) light.
C) water.
D) all of the above
E) none of the above
Answer: D
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A certain laser radiates with a wavelength of 2488 nm. What is the energy difference, in electron volts, between the two energy levels involved in producing this light?
A) 0.50 eV B) 0.65 eV C) 0.45 eV D) 0.60 eV E) 0.55 eV
If the accretion disk around a black hole emits X-rays outside the event horizon, the X-rays can escape
Indicate whether the statement is true or false
The Earth's hotter, inner core is liquid and its cooler, outer core is solid
Indicate whether the statement is true or false
A Trombe wall is a masonry wall often used in passive solar homes to store solar energy. Suppose that such a wall, fabricated from 20-cm-thick solid concrete blocks (k = 0.13 W/(mK), ? = 0.05 × 10–5 m2/s) is initially at 15°C in equilibrium with the room in which it is located. It is suddenly exposed to sunlight and absorbs 500 W/m2 on the exposed face. The exposed face loses heat by radiation and convection to the outside ambient temperature of –15°C through a combined heat transfer coefficient of 10 W/(m2 K). The other face of the wall is exposed to the room air through a heat transfer coefficient of 10 W/(m2 K). Assuming that the room air temperature does not change, determine the maximum temperature in the wall after 4 hours of exposure and the net heat transferred to the room.
GIVEN • Trombe wall suddenly exposed to sunlight FIND (a) Maximum temperature in the wall after 4 hours (b) Heat input to the room