Which of the following wave characterstics is the same for any electromagnetic w

Question

Which of the following wave characterstics is the same for any electromagnetic wave traveling through empty space? A-Frequency B-Period C-Speed D-Wavelength 2)A 1Kg smple of liquid water and a 1kg Sample of Ice are placed on a table. Which of the following statements best compares these two samples? A-the liquid water has a larger volume than ice B-The liquid water has a greater weight than the ice C-water has more thermal energy than ice D-the liquid water has more gravitational potential energy than ice 3)The planet mars has two moons. Phobos and Deimos. What is the direction of the force that keeps phobos Orbiting mars? A-Toward the sun B-Toward Deimos C-Toward the center of mars D-Toward the north pole of mars 4)A circuit has a light bulb connected to a constant voltage source. Which of the following changes must increase the power in the circuit? A-Using a light bulb that is more efficient B-Using a ligt bulb that draws more current C-That is rated to last longer D-that has larger resistance

Explanation / Answer

1) its frequency remains same, if the n value changes for medium, its speed and wavelength take care the changes

2. C. water has more thermal energy than ice, KE= kT (temperature)

3.toward the centre of the mars, since the size of the moons are very less

4. power of the circuit is related to current I and resistance R, P=I^2R, hence if u increase current and R , increment of the current acts as double time for the increment, hence it should draw more current,

option B.

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