The kind of waves that travel fastest through a long metal rod have
A) short wavelengths.
B) waves of medium length.
C) long wavelengths.
D) all have the same speed
Answer: D
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One section of a pipe carrying water has a cross-sectional area of 16 cm2; in this section the water has flow velocity of 1.0 m/s. Another section of this pipe has a constricted cross-sectional area of 4 cm2. If the flow is steady, what is the water velocity in the constricted section?
A. 4.0 m/s B. 0.50 m/s C. 1.0 m/s D. 2.0 m/s E. 0.25 m/s
Which statement about the cosmic microwave background is not true?
A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies. B) Its spectrum corresponds to a temperature of just under 3 degrees above absolute zero. C) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old. D) With the exception of very small variations, it appears essentially the same in all directions in which we look into space.
Suppose that at a certain time a quanton has a well-defined wavelength of 0.15 nm. At that time, we perform an experiment to locate the quanton and get the result x = 0.45 nm to a high degree of precision. What can we say about the wavelength of the quanton’s wave function after the experiment?
A. It is still 0.15 nm. B. It is now 0.30 nm. C. It is now 0.45 nm. D. It is now not well-defined. E. Other (specify).
In a reflecting telescope, the objective is a mirror
Indicate whether the statement is true or false