A fast duck is flying 
mi/h at the same altitude as a slow airplane flying with a velocity of 
mi/h. How fast and in what direction is the duck moving relative to the airplane?
What will be an ideal response?
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The atomic number equals the number of protons in a nucleus
Indicate whether the statement is true or false
If R1 < R2 < R3, and if these resistors are connected in series in a circuit, which one dissipates the greatest power?
a. R1 c. R2 b. R3 d. All are equal in power dissipation.
A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 10 mW. How many photons are emitted each second? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, and 1 nm = 10-9 m)
a. 4.8 × 10^17 c. 3.2 × 10^16 b. 1.6 × 10^15 d. 2.6 × 10^18
A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, its intensity:
1.increases. 2.decreases. 3.stays constant.