We can determine the surface temperature of a star from
a. studying its continuous spectrum.
b. studying its line absorption spectrum.
c. measuring the star's luminosity.
d. Both a and c
e. All of a, b, and c
E
You might also like to view...
A planar loop consisting of seven turns of wire, each of which encloses 200 cm2, is oriented perpendicularly to a magnetic field that increases uniformly in magnitude from 14 × 10^–3 T to 38 × 10^–3 T in a time of 8.0 × 10^–3 s. What is the resulting induced current in the coil if the resistance of the coil is 5.0 ??
a. 1.2E–2 A b. 1.2E+0 A c. 1.3E–1 A d. 8.4E–2 A e. 7.7E–1 A
Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following best describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter from the Sun. B) Earth is the size of a golf ball about 1 meter from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters from the Sun. D) Earth is the size of a golf ball about 15 meters from the Sun. E) Earth is the size of a marble about 25 miles from the Sun.
In regard to the Compton scattering experiment with x-rays incident upon a carbon block, as the scattering angle becomes larger, what happens to the magnitude of difference between the incident and scattered wavelengths?
a. increases b. decreases c. remains constant d. difference is maximum at a 45° angle of scatter
Energy in Capacitors: An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates. If the separation between the plates is now doubled, the amount of electrical energy stored on the capacitor will
A. double. B. quadruple. C. be cut in half. D. be cut in fourth. E. not change.