# Worksheet: Energy and Wavelength

Q1:

In a flame test, bismuth atoms emit photons with an energy of 4.042 eV.

Calculate the wavelength of the emitted photons.

Calculate the energy per mole of emitted photons.

Q2:

Heated barium ions emit photons with an energy of 2.722 eV.

Calculate the wavelength of the emitted photons.

Calculate the energy per mole of emitted photons.

Q3:

Mercury atoms in a high-pressure lamp emit photons with an energy of 6.705 eV.

Calculate the wavelength of the emitted photons.

Calculate the energy per mole of emitted photons.

Q4:

The atomic emission spectrum of nitrogen contains a strong line corresponding to photons with an energy of J.

Calculate the wavelength of the emitted photons.

Calculate the energy per mole of emitted photons.

Q5:

Atomic emission spectra of the hydrogen atom show a red line at a wavelength of 656 nm. Given that the speed of light is and Planck’s constant is , what is the energy possessed by one photon at this wavelength?

• A
• B
• C
• D

Q6:

The atomic emission spectrum of the hydrogen atom shows a violet line at a wavelength of 434.0 nm. Calculate the energy of one photon at this wavelength. Use a value of for the speed of light and for Planck’s constant.

• A
• B
• C
• D

Q7:

How many infrared photons with a wavelength of m must be absorbed by 190 g of water to increase the temperature from 25.0 to ? The specific heat capacity of water is 4.184 J/g⋅K.

• A 90.9 mmol
• B 82.4 mmol
• C 83.0 mmol
• D 86.4 mmol
• E 77.7 mmol

Q8:

Heated thallium ions emit photons with an energy of J.

Calculate the wavelength of the emitted photons.

Calculate the energy per mole of emitted photons.