1. The energy needed to remove an electron from an atom is just above the:

Group of answer choices

second excited energy level

ionization energy

first excited energy level

ground state energy

2. The light emitted by a single laser consists of:

Group of answer choices

multiple frequencies

one frequency

the full spectrum

a continuous spectrum

3. The highest energy level in an atom is its

Group of answer choices

ionization level.

ground state.

photon level.

emission level.

absorption level.

4. An atom can be excited into a higher energy state by

Group of answer choices

decreasing its de Broglie wavelength.

absorbing a photon.

emitting a photon.

undergoing the photoelectric effect.

the uncertainty principle.

5. Laser light is:

Group of answer choices

spontaneous emission of radiation

specular reflection

diffuse reflection

stimulated emission of radiation

6. As the temperature of a blackbody increases, the peak of its radiation curve moves

Group of answer choices (Can be select more than one)

toward smaller wavelength.

none of the above.

toward larger wavelength.

upward toward higher intensity.

downward toward lower intensity.

7. Which of the following increases the energy of photons emitted by a light source?

Group of answer choices

increasing the frequency of light

increasing the brightness of light

increasing the wavelength of light

No answer text provided.

8. The best precision that can be achieved in the measurement of an electron's position and momentum is limited by:

Group of answer choices

Bohr's atomic model

Pauli's exclusion principle

Heisenberg's uncertainty principle

Einstein's theory of relativity

9. Spectroscopy is a method that allows identifying elements in a luminous gas from its

Group of answer choices

blackbody radiation

emission-line spectrum

No answer text provided.

continuous spectrum

10. The spectra of different elements can be distinguished because

Group of answer choices

they have spectral lines in different positions.

they have the same spectral lines, but the lines are of different intensities.

every element has one unique spectral line.

none of the above

11. An alpha particle is another name for a(n)

Group of answer choices

neutron.

helium nucleus.

electron.

photon.

proton.

12. If someone tells you they have a sample of niobium-90, can you tell how many neutrons are in the nucleus?

Group of answer choices

Yes, there are 49 neutrons.

No, more information must be given.

No, there is no such thing as "niobium."

Yes, there are 90 neutrons.

Yes, there are 41 neutrons.

13. Why is there a radioactive source in a smoke detector?

Group of answer choices

It powers the alarm when the battery wears out.

none of the above

It makes the smoke particles radioactive.

It ionizes the air.

14. How can an electron be ejected from a nucleus in beta decay if it wasn't in the nucleus to begin with?

Group of answer choices

A proton in the nucleus turns into a neutron, electron, and a neutrino.

The electron doesn't come from the nucleus?it comes from an orbit circling the nucleus.

none of the above

A neutron in the nucleus turns into a proton, electron, and a neutrino.

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