In an experiment different wavelengths of light, all able to eject photoelectrons, shine on a freshly prepared (oxide-free) zinc surface. Which statement is true?
a. The number of photoelectrons emitted per second is independent of the intensity of the light for all the different wavelengths.
b. The number of photoelectrons emitted per second is directly proportional to the frequency for all the different wavelengths.
c. The maximum kinetic energy of the photoelectrons emitted is directly proportional to the frequency for each wavelength present.
d. The maximum kinetic energy of the photoelectrons has a linear relationship with the frequency for each wavelength present.
e. The maximum kinetic energy of the photoelectrons is proportional to the intensity of the light and independent of the frequency.
d
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Notice the numbered points on this photo of the Gemini North reflecting telescope. Where is the secondary mirror located?
A) Point 1 B) Point 2 C) Point 3 D) Point 4
An ideal solenoid of radius a has n turns per unit length and current I. The magnetic flux ?B through any area completely inside the solenoid, centered on the solenoid axis but at a 45° angle to the axis so that it touches the inside of the solenoid as shown below, is
?
?
A.
.B.
.C.
D.
E.
A +15-nC point charge is placed on the x axis at x = 1.5 m, and a ?20-nC charge is placed on the y axis at y = ?2.0m. What is the magnitude of the electric field at the origin?
A. 105 N/C B. 15 N/C C. 75 N/C D. 45 N/C E. 60 N/C
What are the formula masses of water, H20; propene, C3H6; and 2-propanol, C3H8O?
A) water: 18 amu; propene: 40 amu; 2-propanol: 58 amu B) water: 18 amu; propene: 42 amu; 2-propanol: 62 amu C) water: 18 amu; propene: 42 amu; 2-propanol: 60 amu D) water: 18 amu; propene: 44 amu; 2-propanol: 64 amu