An isolated black hole in empty intergalactic space would be difficult to detect because
a. there would be no stars behind it whose light it could bend or lens gravitationally
b. it could not emit light from inside its event horizon
c. no companion stars would be affected by its gravitational field
d. no matter would be falling into it to create an x-ray emitting accretion disk
e. All of the above
E
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Energy transport by ____________________ is important when photons cannot readily travel through a gas
Fill in the blank(s) with correct word
A proton's rest mass is 1.67 × 10?27 kg. Calculate its total energy when it is accelerated to a speed of 0.80c.
A. 1.5 × 10?10 J B. 1.0 × 10?10 J C. 2.5 × 10?10 J D. 2.0 × 10?10 J E. 7.5 × 10?10 J
Show the relationship between wave speed and wave frequency. If the speed of a longitudinal wave is 340 m/s and the frequency is 1000 Hz, what is the wavelength of the wave?
What will be an ideal response?
A p-type semiconductor is produced by
A) doping the host crystal with donor impurities. B) pure crystals of germanium. C) doping the host crystal with acceptor impurities.