In making a transition from state n = 1 to state n = 2, the hydrogen atom must
A) absorb a photon of energy 10.2 eV.
B) emit a photon of energy 10.2 eV.
C) absorb a photon of energy 13.58 eV.
D) emit a photon of energy 13.58 eV.
A
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______________is an alloy of copper and tin.
Fill in the blank(s) with the appropriate word(s).
The distance between the object to be viewed and the eyepiece of a compound microscope is 18.0 cm
The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm. The near-point distance of the person using the microscope is 25.0 cm. What is the magnitude of the total magnification of the microscope if it is designed for minimum eyestrain? A) 120 B) 184 C) 200 D) 360 E) 480
The process that effectively regulates Earth's average temperature is
a. the greenhouse effect. b. Rayleigh scattering. c. the dew point. d. auroras.
A dipole radio transmitter has its rod shaped antenna oriented vertically. At a point due south of the transmitter, the radio waves have their magnetic field
A. oriented in a horizontal direction. B. oriented east-west. C. oriented vertically. D. oriented north-south.