Emission lines of hydrogen that are found in the ultraviolet part of the electromagnetic spectrum are formed by electrons transitioning from:
A) any level to level 2.
B) level 2 to any level.
C) any level to level 1.
D) level 1 to any level.
E) any level to level 3.
C
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Standing Sound Waves: An organ pipe that is 1.75 m long and open at both ends produces sound of frequency 303 Hz when resonating in its second overtone. What is the speed of sound in the room?
Fill in the blank(s) with the appropriate word(s).
Magnetism is due to the motion of electrons as they
A) move around the nucleus. B) spin on their axes. C) both of these D) neither of these
When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of
a. interference. b. diffraction. c. specular reflection. d. diffuse reflection. e. polarization.
If 5.0 × 10^21 electrons pass through a 20-W resistor in 10 min, what is the potential difference across the resistor?
a. 21 V b. 32 V c. 27 V d. 37 V e. 54 V