What are the important relics of the quark epoch? Why?
What will be an ideal response?
Quarks condensed to form massive neutrons and protons, the particles that make up most of the normal matter in the universe.
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Why do optical astronomers often put their telescopes at the tops of mountains, whereas radio astronomers sometimes put their telescopes in deep valleys?
What will be an ideal response?
An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor, and inductor, or a capacitor. At time t = 0 the voltage is zero
At time t = T/4 the current in the unknown element is equal to zero, and at time t = T/2 the current is I = -Imax, where Imax is the current amplitude. What is the unknown element? A) a resistor B) an inductor C) a capacitor D) an inductor or a capacitor
The magnitude of the Coriolis force varies according to two factors:
A) the velocity of the moving object and the pressure-gradient force. B) temperature and pressure. C) the velocity of the moving object and the degree of latitude. D) frictional force and pressure-gradient force.
A photon whose energy is 8.00 × 10^-15 J is scattered off an electron at a 90° angle. What is the wavelength of the scattered wave?
a. 2.73 × 10^-11 m b. 2.25 × 10^-11 m c. 2.50 × 10^-11 m d. 2.40 × 10^-12 m e. 2.48 × 10^-11 m