The set of nuclear reactions that power our sun can be summarized ...

[MirandaLo]

The set of nuclear reactions that power our sun can be summarized a 4p+  4He+2 + 2e+. The masses of the particles involved are 938.272 MeV/c2 (proton, p+), 3727.38 MeV/c2 (alpha particle, 4He+2), and 0.511 MeV/c2 (positron, e+).
 
  How much energy is released by each set of these reactions?
  A) 2790 MeV B) 279 MeV C) 24.69 MeV D) 28.3 MeV

Question 2

Two radio antennas are 120 m apart on a north-south line, and they radiate in phase at a frequency of 3.4 MHz.
 
  All radio measurements are made far from the antennas. If the east-west reference line passes midway between the two antennas, what is the smallest angle from the antennas, measured north of east, at which constructive interference of two radio waves occurs? (c = 3.00  108 m/s)
  A) 30 B) 47 C) 43 D) 68 E) 22

[patma1981]

Answer to Question 1

C

Answer to Question 2

B

[MirandaLo]

TYSM

[okolip]

Excellent