A particle in a box with zero point energy E1= 4.0 eV, undergoes a transition from the third excited state to the second excited state emitting a photon. What is the energy of the photon?

A. 4.0 eV
B. 16 eV
C. 20 eV
D. 28 eV
E. 26 eV

C. 20 eV

Physics & Space Science

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Ethylene glycol, at 100ºC, is cooled along a vertical flat plate at 20ºC. The plate is 1 m high and 0.5 m wide. Estimate the heat transfer.

What will be an ideal response?

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A weightless spring is stretched 10 cm by a suspended 1-kg block. If two such springs are used to suspend the block, one spring above the other, to effectively provide one double-length spring, then the total stretch of the double-length spring will be

A) 5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of the above

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Which of the following is NOT a general selection rule for the filling of electron shells?

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What is the change in entropy when 1 kg of ice melts at 0°C is (in J/K)? (LF,ice = 333 J/g.)

a. 335. b. 603. c. 1220. d. 1310. e. 2160.

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