Which of the following is formed by direct freezing of water droplets?

a. Dew
b. Snow
c. Sleet
d. Frost


c

Physics & Space Science

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According to our theory of solar system formation, where did the comets of the Oort cloud form?

A) in the inner solar system B) far beyond the orbit of Pluto C) in the region of the jovian planets D) in the asteroid belt

Physics & Space Science

Which of the following statements about quantum tunneling is not true?

A) Although it has been observed to occur, it violates all other known laws of nature and explaining it therefore represents a major challenge to physicists. B) It is used in modern electronics and, in fact, our modern-day computers would not work without it. C) It plays a crucial role in nuclear fusion in the Sun. D) It allows electrons and other subatomic particles to pass through wall-like energy barriers even when it seems they do not have enough energy to get through the barriers.

Physics & Space Science

What can exist in the same place at the same time?

A) two large boulders B) two tiny boulders C) two waves D) all of the above E) none of the above

Physics & Space Science

What is happening at the anodic region?

Rust has a tendency to form when iron in contact with water reacts according to the following reaction: 4 Fe + 3 O2 ? 2 Fe2O3 A) Iron is being oxidized. B) Oxygen is being oxidized. C) Oxygen is being reduced. D) Iron is being reduced. E) none of the above

Physics & Space Science