Suppose you are listening to a radio station that broadcasts at a frequency of 97 Mhz (megahertz). Which of the following statements is true?
A) The radio waves from the radio station are causing electrons in your radio's antenna to move up and down 97 million times each second.
B) The radio waves from the radio station have a wavelength of 97 million meters.
C) The "radio waves" received by your radio are not light waves like those we talk about in astronomy, but rather are a special type of sound wave.
D) The radio station broadcasts its signal with a power of 97 million watts.
A
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A diffraction grating is to be used to find the wavelength of the light in the emission spectrum of a gas
The grating spacing is not known, but a light having a known wavelength of 632.8 nm is deflected by 43.2° away from the central maximum in the second order by this grating. Light of the wavelength to be measured is deflected by 48.2° away from the central maximum in the second order. What is the wavelength of this light?
A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V?
a. QVB toward the east b. Zero c. QVB toward the west d. QVB upward e. QVB toward the south
Chondritic meteorites provide important clues because they are believed to
A. contain grains from the first material that condensed out of the Solar nebula. B. be the only source of the necessary amino acids required for life. C. be the source of all coal found on Earth. D. contain many rare metals.
Determine the energy stored in the 40-?F capacitor
a.
2.4 mJ
b.
1.6 mJ
c.
2.0 mJ
d.
2.9 mJ
e.
4.0 mJ