Most scientists think catastrophes played little role in the solar system's history
Indicate whether the statement is true or false
FALSE
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A researcher is using x-rays to investigating a cubic crystal. He is looking at Bragg reflection from the planes parallel to the cube faces
He finds that when using x-rays with a wavelength of 0.165 nm, a strong first maximum occurs when the beam makes an angle of 23.5° with the planes. What is the spacing of adjacent atoms in this crystal?
Radioactivity in the Earth leads to
A. energy for volcanoes B. helium for toy balloons C. heat for geysers D. all of the above
The total energy radiated by a blackbody depends on:
A) the fourth power of its temperature. B) the square of its temperature. C) the square root of its temperature. D) the cube root of its temperature. E) the cube of its temperature.
A student is sitting on the right side of a school bus when it makes a right turn. We know that the force of gravity acts downwards and a normal force from the seat acts upwards. If the student stays in place when the bus turns, we also know that there must be
a. no other force on the student. b. a force parallel to the seat directed forward on the student. c. a force parallel to the seat directed to the left on the student. d. a force parallel to the seat directed to the right on the student. e. a force parallel to the seat in a direction between forward and left on the student.