The energy level diagram for hydrogen



The energy of a photon emitted in a transition from the n = 3 state to the n = 2 state is __________.


1.9 eV

Physics & Space Science

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Two parallel surfaces are separated by 1 m. One of the surfaces has a temperature of 177ºC and the other surface is 27ºC. A heat shield is placed midway between the two surfaces. Estimate the shield temperature.

What will be an ideal response?

Physics & Space Science

One beam of coherent light travels path P1 in arriving at point Q and another coherent beam travels path P2 in arriving at the same point. If these two beams are to interfere destructively, the path difference P1 - P2 must be equal to

A) an odd number of half-wavelengths. B) a whole number of wavelengths. C) zero. D) a whole number of half-wavelengths.

Physics & Space Science

A ball is thrown upward. After the ball is released upward and is in the air, its acceleration

1.remains the same. 2.increases. 3.decreases and then increases. 4.increases and then decreases.

Physics & Space Science

The coil shown in the figure has 2 turns, a cross-sectional area of 0.20 m2, and a field (parallel to the axis of the coil) with a magnitude given by B = (4.0 + 3.0t2) T, where t is in s. What is the potential difference, VA ? VC, at t = 3.0 s?



a.
?7.2 V

b.
+7.2 V

c.
?4.8 V

d.
+4.8 V

e.
?12 V

Physics & Space Science