Derive the general energy equation for conduction heat transfer through a homogeneous, isotropic media in spherical coordinates, Equation 2-20.
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Is it possible for the decay product of radioactive decay to be radioactive? Explain
What will be an ideal response?
Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. The number of fringes per unit length on the screen can be halved
A.
.B.
.C.
the wavelength is changed to 
.D.
E.
.___________ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar
a. A double-lobed radio galaxy b. Superluminal expansion c. The gravitational lens effect d. A blazar e. Gravitational waves
Venus and Mars probably evolved differently from Earth because:
A) they are slightly bigger than Earth. B) they are more massive than Earth. C) they have thicker atmospheres than the Earth. D) they formed sooner than Earth. E) they orbit at different distances from the Sun.