1)According to the Bohr model of the hydrogen atom A) an electron in ground stat

Question

1)According to the Bohr model of the hydrogen atom

A) an electron in ground state can absorb a photon with wavelength of 410 nm

B) an electron in great shape can absorb a photon with wavelength of 410 nm

C) an electron in n=2 excited state can absorb a photon with wavelength of 410 nm

D) an electron in n=3 excited state can absorb a photon with wavelength of 410 nm

E) an electron in n=4 excited state can absorb a photon with wavelength of 410 nm

F) such photon cannot not be absorbed at all by a hydrogen atom

2)A halo

A) is formed by dispersion of light rays on hexagonal ice crystals

B) circles the sun or the moon at 22 ° from their center

C) is sometimes accompanied by sundogs

D) all of the above

E) is sometimes fetched by the dogs

3)The sky looks blue during the day because

A) it feels gloomy

B) air molecules emit blue light

C) it’s not the night

D) air molecules are more effective at scattering long wavelengths of light in all directions

E) air molecules are more effective at scattering short wavelengths of light in all directions

F) air molecules equally effective at scattering all wavelengths of light

4)On a scale where the Sun is about the size of a grapefruit, how far away is the nearest star: Proxima Centauri?

A) about 100 meters away

B) about 300 meters away

C) about 450 meters away

D) few miles away

E) about the distance across the state of Virginia

F) about the distance across the United States

5)On a scale where the Sun is about the size of a grapefruit

A) the Earth would be the size of a baseball

B) the Earth would be the size of a marble

C) the Earth would be the size of a ball point

D) the Earth would be microscopic

6)On a scale where the atomic nucleus is about the size of a green pea

A) an atom would be about the size of a marble

B) an atom would be about the size of a baseball

C) an atom would be about the size of a basketball

D) an atom would be about the size of a sphere with radius of 300 feet

E) an atom would be about the size of a sphere with radius the distance across the state of Virginia

F) an atom would be about the size of a sphere with radius the distance across the United States

7)Which is false?

A) some atomic nuclei can break apart spontaneously

B) atomic nuclei can only be broken apart when hit by very energetic particles

C) it is not possible to convert lead to gold by means of chemical reaction

D) it is possible to convert lead to gold by means of nuclear reaction

E) it is possible to extract energy when light atoms nuclei combine into heavier ones

F) it is possible to extract energy when heavy atoms break apart.

Explanation / Answer

2)

A) is formed by dispersion of light rays on hexagonal ice crystals

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3)D) air molecules are more effective at scattering long wavelengths of light in all directions

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

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4)

D) few miles away

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