Sometimes the current in lamps is too feeble to produce glowing of the lamp filaments, which occurs when

A) too many lamps are connected in series.
B) too many lamps are connected in parallel.
C) too much current is drawn by the battery.

Answer: A

Physics & Space Science

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A hot luminous solid emits a ______________ spectrum, while a hot luminous gas produces a ______ spectrum

Fill in the blank(s) with correct word

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Which planet(s) have an atmosphere that consists mostly of carbon dioxide?

A) Venus and Mars B) Venus, Earth, and Mars C) Venus only D) Mars only

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A particle moves along the x-axis in the positive direction with energy E. It encounters a barrier with potential V > E at x = 0 and extending to x = L. Is there any chance for the particle make it to the other side?

a. Yes. The wave functions allow for a small probability for the particle to pass through the barrier. b. Yes, but only if the particle increases in energy so that E > V.

c. Yes. The particle will pass by unaffected in both classical and quantum mechanical consideration. d. No. An incoming particle would have negative kinetic energy within the potential barrier. e. No. The particle will transmit some energy but the particle will always reflect off the barrier.

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Semiconductors: A p-type semiconductor is produced by

A. doping the host crystal with donor impurities. B. doping the host crystal with acceptor impurities. C. pure crystals of germanium.

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