Farid lists three photons: one from a radio station's antenna, one of green light from a stage lamp, and one from the dentist's X-ray machine. He wants them ranked by energy, least to most.
You have ranked the electromagnetic spectrum by frequency and energy before. The one new step: the quantity ranked here is the energy per photon, not the energy of a whole beam.
The spectrum's frequency order is built knowledge: radio lowest, then microwave, infrared, visible, ultraviolet, X-ray, and gamma highest.
A photon's energy rises with the light's frequency. So the spectrum's frequency order is also the energy-per-photon order.
Place Farid's three: radio sits lowest, green light sits in the visible band, X-rays sit near the top.
So the ranking, least to most energetic: the radio photon, the green-light photon, the X-ray photon.
A powerful beam of a low band can deliver more total energy each second than a faint beam of a high band. Per photon, the high band still wins.
Rank Farid's three photons from least to most energetic: the radio photon, the green-light photon, the X-ray photon.
Radio sits at the spectrum's low-frequency end.
Green light sits in the visible band, in the middle.
X-rays sit near the high-frequency top, and energy per photon follows frequency.
Least to most: the radio photon, then the green-light photon, then the X-ray photon.
Rank these photons from least to most energetic: one gamma photon, one microwave photon, one ultraviolet photon.
Microwave sits just above radio, near the spectrum's low end.
Ultraviolet sits above visible light.
Gamma sits at the very top, so its photon is the biggest lump.
Least to most: the microwave photon, then the ultraviolet photon, then the gamma photon.
Which single photon carries the most energy: one microwave photon, one infrared photon, or one ultraviolet photon?
Rank these photons from least to most energetic: one visible-light photon, one radio photon, one gamma photon.
Hamish says: 'One gamma photon carries more energy than one radio photon.' Is Hamish correct?
Rank these photons from least to most energetic: one infrared photon, one X-ray photon, one microwave photon.
A strong microwave beam delivers far more total energy each second than a faint ultraviolet beam. Which light carries more energy per photon?
Which single photon is the least energetic: one from visible light, one from infrared light, or one from ultraviolet light?