Catch the false line on light

Exercise and reference answers

Questions

1. False statement

   Brighter light raises the maximum energy of each electron.

   Statements

   1. Brighter light frees more photoelectrons every second.
   2. Brighter light raises the maximum energy of each electron.
   3. The maximum energy of an electron is set by the frequency.

2. False statement

   Below the threshold frequency a bright enough lamp still works.

   Statements

   1. Below the threshold frequency no electrons come out at all.
   2. Threshold frequency is the work function over Planck's constant.
   3. Below the threshold frequency a bright enough lamp still works.

3. False statement

   A fast electron carries a longer wavelength than a slow one.

   Statements

   1. A fast electron carries a longer wavelength than a slow one.
   2. A slow electron carries a long de Broglie wavelength.
   3. A one kilogram ball has a wavelength far too small to detect.

Instructions

Each set of three lines about photons and electron waves hides one that is false. Tap it.

Explanation