A photocathode having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 3.4 eV
What is maximum kinetic energy of the photoelectrons produced?(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 1.6 × 10-19 J
B) 3.8 × 10-19 J
C) 4.4 × 10-19 J
D) 4.9 × 10-19 J
E) 5.4 × 10-19 J
A
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What is a quasar?
A) a starlike object that actually represents a bright patch of gas in the Milky Way B) a very large galaxy thought to be formed by the merger of several smaller galaxies, resulting in a quick burst of star formation C) the name given to the largest objects in the Kuiper Belt D) the extremely bright center of a distant galaxy E) another name for very bright stars of spectral type O
On a horizontal frictionless floor, a worker of weight 0.900 kN pushes horizontally with a force of 0.200 kN on a box weighing 1.80 kN. As a result of this push, which statement could be true?
A) The box will not move because the push is less than its weight. B) The worker and box will both have an acceleration of 1.08 m/s2, but in opposite directions. C) The worker and box will both have an acceleration of 2.17 m/s2, but in opposite directions. D) The worker will accelerate at 1.08 m/s2 and the box will accelerate at 2.17 m/s2, but in opposite directions. E) The worker will accelerate at 2.17 m/s2 and the box will accelerate at 1.08 m/s2, but in opposite directions.
The quantum hypothesis was originated by?
a)Einstein b)Bohr c)Planck d)Rutherford
A pair of like electric charges
1) repel each other, 2) attract each other, and a pair of like magnetic poles 3) repel each other. 4) attract each other.