How can we see through the interstellar medium?
A) by observing in high-energy wavelengths such as X-rays and long wavelengths of light such as radio waves
B) by observing only the brightest visible sources
C) by using only the biggest telescopes
D) by using telescopes above the Earth's atmosphere
E) We cannot see through the interstellar medium.
A
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A guitar string is supposed to have a fundamental frequency 256 Hz. It currently has a fundamental frequency 248 Hz. What percentage increase in tension is required to bring the guitar string into tune?
A) 3.13% B) 6.56% C) 1.60% D) 6.15% E) 3.23%
The safety fuse in an electric circuit is connected to the circuit in
A) series. B) parallel. C) either series or parallel.
Diffraction grating ?1 has half the lines/cm that diffraction grating ?2 does. When used with a certain wavelength of light, both gratings give first-order maxima. Which of the following statements is true for the same wavelength of light
a. Both gratings must also give second-order maxima. b. Grating ?1 must give a second-order maximum. c. Grating ?2 must give a second-order maximum. d. It is possible that neither grating gives a second-order maximum.