Maxwell guessed that visible light was an electromagnetic wave because of its:
a. energy.
c. wavelength.
b. frequency.
d. speed.
D
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A certain type of atom can only absorb certain wavelengths
a. True b. False Indicate whether the statement is true or false
Resistance and Resistivity: When a potential difference is applied across a piece of wire made of metal A, a 5.0-mA current flows. If the metal-A wire is replaced with a wire made of metal B having twice the diameter of the metal-A wire, how much current will flow through the metal-B wire? The lengths of both wires are the same, and the voltage difference remains unchanged. The resistivity of metal A is 1.68 × 10-8 ? ? m, and the resistivity of metal B is 1.59 × 10-8 ? ? m.
A. 21 mA B. 19 mA C. 11 mA D. 5.3 mA
A string on a violin is stretched between two points 20.00 cm apart with a tension of 120.0 N. The mass/length of the string is 0.002000 kg/m. The frequency of the 2nd overtone is
A. 1,502 Hz. B. 1,837 Hz. C. 2,237 Hz. D. 2,568 Hz. E. 3,250 Hz.
What is the formula of a compound formed from the ions M1+ and X1-?
a. M2X b. MX c. M2X2 d. MX2