Quantum ideas and where they are used

Answer Key - Grade 11 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   With h = 6.62607015 × 10⁻³⁴ J·s and an electron mass of 9.1093837139 × 10⁻³¹ kg (CODATA), what is the wavelength of an electron at 1 × 10⁶ m/s, in nm, Ari?

   0.73 nm
2. 2.

   With h = 6.62607015 × 10⁻³⁴ J·s and an electron mass of 9.1093837139 × 10⁻³¹ kg (CODATA), what is the wavelength of an electron at 0.5 × 10⁶ m/s, in nm, Esme?

   1.45 nm

3. Read this first

   Photon diagram beside a short passage

   “An MRI scanner uses a strong magnet and radio waves. Protons in the body's water line up in the field and give off radio signals that a computer turns into pictures. MRI uses no X-rays.” The diagram shows a proton's spin arrow lined up with a field arrow.

4. 3.

   In the passage, what gives off the signals that make an MRI picture, Jun?

   • X-rays that the scanner sends through the body
   • The scanner's lights
   • Protons in the body's water
5. 4.

   In the passage, what kind of radiation does an MRI scanner use, Kira?

   • Gamma rays
   • Ionizing X-rays passed through the body
   • Non-ionizing radio waves
6. 5.

   Milo reads an ad saying a “quantum bracelet” heals illness. Does quantum physics support this claim?

   • No: physics gives no support for it
   • Yes, because the ad uses a science word
   • Yes, because bracelets touch the skin
7. 6.

   Noah says a “quantum leap” in physics means a huge jump. Agree or disagree?

   • Agree: quantum means huge
   • Agree: electrons leap far away from atoms
   • Disagree: it is a tiny, set step
8. 7.

   Pia says a coin can be heads and tails at once because of superposition. Agree or disagree?

   • Agree: a spinning coin is a quantum object
   • Agree: tossing makes superposition
   • Disagree: that happens in tiny systems
9. 8.

   How are a solar cell and an LED opposites, Ren?

   • They are the same device
   • One turns light into current; the other, current into light
   • A solar cell stores light, and an LED stores current for later
10. 9.

    How does laser light differ from a light bulb's, Tala?

    • It is much hotter
    • Its photons share one color, in step
    • It travels faster
11. 10.

    Why can electron microscopes see smaller details than light microscopes, Zee?

    • Electrons are brighter
    • They use bigger lenses
    • Fast electrons have much shorter wavelengths