A metallic sheet has a large number of slits, 5.0 mm wide and 20 cm apart, and is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet
What is the smallest microwave frequency for which only the central maximum occurs? (c = 3.00 × 108 m/s)
A) 1.0 GHz B) 2.0 GHz C) 0.70 GHz D) 0.50 GHz E) 1.5 GHz
E
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Indicate whether the statement is true or false
A photon scatters off of a stationary electron. Which of the following statements about the photon are true? (There could be more than one correct choice.)
A) Its wavelength increases due to the scattering. B) Its frequency increases due to the scattering. C) Its wavelength decreases due to the scattering. D) Its frequency decreases due to the scattering. E) Its energy does not change.
The figure below shows a planet traveling in a clockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is constant. B. its speed is increasing. C. its speed is decreasing. D. its speed is a maximum. E. its speed is a minimum.
Which of the fundamental interactions governs the following decay? 
A. Weak nuclear B. Electromagnetic C. Gravitational D. Strong nuclear