Why do the present methods of finding extrasolar planets (Doppler measurement and planetary transits) not favor finding solar systems like ours?
What will be an ideal response?
Doppler shifts are greatest for rapidly moving stars, where their planets are moving very close to them and with periods of much less than a year. Only Jovian planets will have the mass needed to exert detectible pulls such as this also.
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____________________ appear reddish in color due to the light emitted by the Balmer series of the hydrogen atom
Fill in the blank(s) with correct word
A hot-wire anemometer is used to determine the boundary layer velocity profile in the air flow over a scale model of an automobile. The hot-wire is held in a traversing mechanism that moves the wire in a direction normal to the surface of the model. The hot-wire is operated at constant temperature. The boundary layer thickness is to be defined as the distance from the model surface at which the velocity is 90% of the free stream velocity. If the probe current is I0, when the hot-wire is held in the free stream velocity, U?, what current indicates the edge of the boundary layer? Neglect radiation heat transfer from the hot-wire and conduction from the ends of the wire.
GIVEN • Thin, electrically-heated constant-temperature wire in air flow near an automobile model • Boundary layer thickness ° point when velocity (Uy) = 90% free stream velocity Vo • Probe current at U? = Io FIND • Probe current at edge of the boundary layer (Ib) ASSUMPTIONS • Radiation is negligible • Conduction from the ends of the hot-wire is negligible • Reynolds number is small
The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of a photon emitted corresponding to a transition from the n = 5 to n = 3 state?
a. 0.97 eV b. 1.81 eV c. 3.40 eV d. 6.80 eV e. 0.24 eV
Periods are divided into
a. eons. b. epochs. c. millennia. d. eras.