How is quantum tunneling important to our existence here on Earth?
A) It plays a crucial role in nuclear fusion in the Sun, so that our Sun would not shine brightly without it.
B) It explains how neutron stars are able to stay stable rather than collapsing under their strong gravity.
C) It explains why electrons in atoms gradually fill different energy levels, thus making chemistry possible.
D) It is important to understanding the law of conservation of energy.
A) It plays a crucial role in nuclear fusion in the Sun, so that our Sun would not shine brightly without it.
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A charged particle (mass = 4.0 ?g, charge = 5.0 ?C) moves in a region where the only force on it is magnetic. What is the magnitude of the acceleration of the particle at a point where the speed of the particle is 5.0 km/s, the magnitude of the magnetic field is 8.0 mT, and the angle between the direction of the magnetic field and the velocity of the particle is 60°?
A. 39 km/s2 B. 43 km/s2 C. 48 km/s2 D. 52 km/s2 E. 25 km/s2
On which planet (other than Earth) have air bags been deployed?
a. Venus b. Mars c. Mercury d. Saturn
The iron in our solar system was created from smaller mass atomic nuclei in ______
a. the Earth b. our sun c. Jupiter d. the Big Bang e. supernovas
Electromagnetic waves consist of
A) compressions and rarefactions of electromagnetic pulses. B) oscillating electric and magnetic fields. C) particles of light energy. D) high-frequency sound waves.