Which of the following statements about electromagnetic waves in free space are true? (There could be more than one correct choice.)
A) The higher-frequency waves have shorter wavelengths than the lower-frequency waves.
B) The higher-frequency travel faster than the lower-frequency waves.
C) The wavelengths of the visible waves are some of the longest electromagnetic waves.
D) The wavelengths of the visible waves are some of the shortest electromagnetic waves.
E) The electric field vector is always at right angles to the magnetic field vector.
A, E
You might also like to view...
Most of the planets found orbiting other stars are similar to Jupiter, but ________ in temperature
Fill in the blank(s) with correct word
A thin lens has a focal length of 10.00 cm for blue light. If the index of refraction for the lens material tends to decrease with increasing wavelength, what is the focal length of the lens for red light?
a. more than 10.00 cm b. It depends on whether the lens is converging or diverging. c. also 10.00 cm d. less that 10.00 cm
A 5.0-liter gas tank holds 1.4 moles of helium (He) and 0.70 moles of oxygen (O2), at a temperature of 260 K
The atomic masses of helium and oxygen are 4.0 g/mol and 16.0 g/mol, respectively. Avogadro's number is 6.022 × 1023 molecules/mol and the Boltzmann constant is 1.38 × 10-23 J/K. The total random translational kinetic energy of the gas in the tank is closest to A) 6.8 kJ. B) 6.1 kJ. C) 7.6 kJ. D) 8.3 kJ. E) 9.1 kJ.
A small radio-controlled car's motor rated at 6 watts output is capable of performing ________ Joules of work in 15 seconds.
Fill in the blank(s) with the appropriate word(s).