Quantum ideas and where they are used

Answer Key - Grade 11 Science Worksheet

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

1. 1.

   Protons in water respond at 42.577478461 MHz per tesla (CODATA). What radio frequency does an MRI scanner with a 1.5 T magnet use, to 0.01 MHz, Ari?

   63.87 MHz
2. 2.

   Protons in water respond at 42.577478461 MHz per tesla (CODATA). What radio frequency does an MRI scanner with a 3 T magnet use, to 0.01 MHz, Bo?

   127.73 MHz
3. 3.

   Protons in water respond at 42.577478461 MHz per tesla (CODATA). What radio frequency does an MRI scanner with a 0.55 T magnet use, to 0.01 MHz, Esme?

   23.42 MHz

4. Read this first

   Photon diagram beside a short passage

   “A qubit can be in a superposition of 0 and 1 until it is measured; then it gives one answer. Measuring a quantum signal disturbs it, so someone listening in on a quantum message can be noticed.” The diagram shows a qubit arrow between 0 and 1.

5. 4.

   In the passage, what can a qubit do that an ordinary bit can't, Jun?

   • Store far more files than a hard drive
   • Be in a superposition of 0 and 1
   • Work without electricity
6. 5.

   In the passage, what happens when a qubit is measured, Kira?

   • It breaks
   • It stays both 0 and 1, forever after
   • It gives one answer, 0 or 1
7. 6.

   In the passage, why can listening in on a quantum message be noticed, Luz?

   • Listeners give off light
   • Quantum messages are louder
   • Measuring it disturbs it
8. 7.

   What does the uncertainty principle say, in plain terms, Milo?

   • Electrons don't exist
   • Position and momentum can't both be known exactly
   • Small particles can't be measured by any tool or method
9. 8.

   Would better instruments get around the uncertainty principle, Noah?

   • Yes, with a bigger magnet
   • Yes: it is caused by poor tools
   • No: it is part of nature
10. 9.

    Why don't we notice the uncertainty principle with a rolling ball, Pia?

    • Balls are much too smooth for the effect to show
    • The effect is far too small at that size
    • Balls aren't made of atoms
11. 10.

    How do astronomers know which elements are in a distant star, Tala?

    • From the star's size
    • From its temperature alone
    • From the colored lines in its light