The constant term in the Balmer series is called the Rydberg constant
Indicate whether the statement is true or false
TRUE
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An electron moves in a region where the magnetic field is uniform and has a magnitude of 80 ?T. The electron follows a helical path which has a pitch of 9.0 mm and a radius of 2.0 mm. What is the speed of this electron as it moves in this region?
a. 48 km/s b. 28 km/s c. 20 km/s d. 35 km/s e. 8.0 km/s
Mass on a Spring: A 0.50-kg box is attached to an ideal spring of force constant (spring constant) 20 N/m on a horizontal, frictionless floor. The box oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position.(a) What is the amplitude of vibration?(b) At what distance from the equilibrium position are the kinetic energy and the potential energy the same?
What will be an ideal response?
Transformers: A transformer is a device that normally
A. operates on either dc or ac. B. operates only on ac. C. operates only on dc.
Why might excess CO2 in the atmosphere heat up the earth?
A) Because CO2 reacts with and thus destroys the ozone layer. B) Because CO2 absorbs, or traps, infra-red radiation. C) Because CO2 is an important participant in the photosynthesis process. D) Because CO2 absorbs, or traps, ultra-violet radiation. E) Because CO2 increases Earth's "reflectivity."