At what temperature is the same numerical value obtained in Celsius and Fahrenheit?
a. ?40°
b. 0°
c. 40°
d. ?72°
a
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Power: If the voltage across a circuit of constant resistance is doubled, the power dissipated by that circuit will
A. be four times as large. B. be two times as large. C. decrease to one-half the original power. D. decrease to one-fourth the original power.
A projectile is projected from the origin with a velocity of 30.0 m/s at an angle of 40.0 degrees above the horizontal. What is the position vector when the projectile is at the maximum height?
A. X = 45.2 m, Y = 19.0 m B. X = 21.1 m, Y = 19.0 m C. X = 51.1 m, Y = 21.1 m D. X = 45.2 m, Y = 21.1 m E. X = 19.0 m, Y = 17.5 m
How many photons per second emerge from a laser of power 2.00 mW with wavelength 605 nm? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 6.09 × 1015 photons/s B) 5.03 × 1012 photons/s C) 3.07 × 1015 photons/s D) 3.07 × 1013 photons/s
Energy Levels: A hydrogen atom is in its n = 2 excited state when its electron absorbs 9.5 eV in an interaction with a photon. What is the energy of the resulting free electron?
A. 6.1 eV B. 7.9 eV C. 8.2 eV D. 9.2 eV