Which of the following best describes a filtergram?

A) It is a region inside a star where energy is carried outward as rising hot gas.
B) It is composed of ionized gas trapped in a magnetic arch rising up through the photosphere.
C) It is an atom in which an electron has moved from a lower to a higher energy level.
D) It is a photograph taken in the light of a specific region of the spectrum of the Sun.


D

Physics & Space Science

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When it was determined that Sedna has a perihelion distance that is three times further out than Pluto and such an eccentric orbit that it has a period of thousands of years, it was placed in the:

A) Trojan Asteroids. B) Kuiper Belt. C) Kirkwood Gap. D) Oort Cloud. E) Rogue Comets.

Physics & Space Science

A very thin silicon chip is bonded to a 6-mm thick aluminum substrate by a 0.02-mm thick epoxy glue. Both surfaces of this chip-aluminum system are cooled by air at 250C, where the convective heat transfer coefficient of air flow is 100 W/(m2 K). If the heat dissipation per unit area from the chip is 104 W/m2 under steady state condition, draw the thermal circuit for the system and determine the operating temperature of the chip.

GIVEN
Silicon chip bonded to 6-mm thick aluminum substrate bye 0.02-mm thick epoxy glue
Air temperature(T?)=250C
Convective heat transfer coefficient(h?)=100 W/(m2 K)
Heat dissipation from chip(q/A)= 104 W/m2
FIND
Draw thermal circuit of system
Operating temperature of the chip.
ASSUMPTIONS
1-Dimensional Steady state conditions prevail
Negligible heat loss from the sides
Isothermal chip
Negliglble radiation
SKETCH

Physics & Space Science

Herschel's original disk model placed us close to the center of the Galaxy

Indicate whether the statement is true or false

Physics & Space Science

The audible range of sound is from 20 Hz to ______________ kHz

Fill in the blank(s) with correct word

Physics & Space Science