Any reply to a detected SETI signal should
A) be decided upon by the group of scientists who first detected the signal
B) be decided upon by the government of the country who first detected the signal
C) be sent immediately as a signal is received
D) represent a consensus of the Earth's population
D
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In the figure, a very small toy race car of mass m is released from rest on the loop-the-loop track. If it is released at a height 2R above the floor, how high is it above the floor when it leaves the track, neglecting friction?
A) 1.67 R B) 2.00 R C) 1.50 R D) 1.33 R E) 1.25 R
Suppose you were to try to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?
A) 1.022 MeV B) 223. MeV C) 1.88 GeV D) 940. MeV E) 0.47 GeV
If an electron is accelerated from rest through a potential difference of 1500 V, what speed does it reach? (e = 1.60 × 10-19 C , melectron = 9.11 × 10-31 kg)
A) 2.3 × 107 m/s B) 1.9 × 107 m/s C) 1.5 × 107 m/s D) 1.1 × 107 m/s
A 2.00-m long organ pipe is open at one end and closed at the other. Its fundamental tone has wavelength:
a. 8.00 m. c. 2.00 m. b. 4.00 m. d. 1.00 m.