Each pattern shown below would appear on a screen when monochromatic light of wavelength ? first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case does the slit have the greatest width?
A.
B.
C.
D.
E.
Answer: E
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Which of the following statements about the atomic theory of matter is true?
The separation of the strong force and the electroweak force ____
a. provided the energy for a rapid inflation of the early Universe b. created the cosmic microwave background radiation c. balanced the critical density of the Universe to solve the flatness problem d. created dark matter e. created dark energy
Photon Energy: A photon of blue light and a photon of red light are traveling in vacuum. The photon of blue light
A. has a smaller wavelength than a photon of red light and travels with the same speed. B. has a smaller wavelength than a photon of red light and travels with a greater speed. C. has a longer wavelength than a photon of red light and travels with the same speed. D. has a longer wavelength than a photon of red light and travels with a greater speed.
Reactance: The capacitive reactance of a 44-?F capacitor in an ac circuit is 6.0 × 10-2 ?. What is the frequency of the applied signal?
A. 80 Hz B. 17 Hz C. 800 Hz D. 6.0 Hz E. 2.2 Hz