Which of the following technological advances was not useful in the 1930s to advance the study of nuclear reactions?
b.
the two-mile long SLAC accelerator was not established until 1962.
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Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy A. According to Hubble's law, what can you say about their approximate relative distances?
A) Galaxy A is twice as far as Galaxy B. B) Galaxy B is four times as far as Galaxy A. C) Galaxy A is four times as far as Galaxy B. D) Galaxy B is twice as far as Galaxy A. E) Not enough information to say—you need to know Hubble's constant to answer this question.
An object of mass m with a certain initial speed on a horizontal surface comes to rest after traveling a distance of 10 m
If the coefficient of kinetic friction between the object and the horizontal surface is 0.20, what is the initial speed of the object? Use g = 10 m/s2. A) 9.8 m/s B) 6.3 m/s C) 3.6 m/s D) 7.2 m/s E) 8.9 m/s
A hydrogen atom is excited to the n = 9 level. Its decay to the n = 6 level detected in a photographic plate. What is the frequency of the light photographed? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 5910 nm B) 5910 Hz C) 5.08 × 1013 Hz D) 3.28 × 10-9 km
Does radiation affect the measurement of temperature with a thermocouple?
What will be an ideal response?