Photon Energy: A laser pulse of duration 25 ms has a total energy of 1.4 J. If the wavelength of this radiation is 567 nm, how many photons are emitted in one pulse? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 4.0 × 1018
B. 9.9 × 1019
C. 4.8 × 1019
D. 1.6 × 1017
E. 3.2 × 1017
Answer: A
Physics & Space Science
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Fill in the blank(s) with correct word
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Radioactivity Basics: A nuclear reaction is shown: 
B + 
He ? 
H + ? . Which one of the following isotopes is the missing nuclear product?
A. 
F
B. 
N
C. 
C
D. 
N
E. 
N
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Galileo deduced many empirical laws of motion before Newton was even born.
Answer the following statement true (T) or false (F)
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Once carbon is formed in massive star cores, the majority of nuclei formed from then on will belong to even numbered elements, due to addition to more helium nuclei as alpha particles
Indicate whether the statement is true or false
Physics & Space Science