[Solved] You want to calculate the energy of a photon with wavelength 400 nm using scipy.constants. Which code snippet correctly computes and prints the energy in electronvolts (eV)? | SciPy

SciPy - Constants and Special Functions

You want to calculate the energy of a photon with wavelength 400 nm using scipy.constants. Which code snippet correctly computes and prints the energy in electronvolts (eV)?

Afrom scipy.constants import c, planck wavelength = 400e-9 energy_ev = planck * c / wavelength print(round(energy_ev, 3))

Bfrom scipy.constants import c, planck, electron_volt wavelength = 400e-9 energy_joule = planck * c / wavelength energy_ev = energy_joule / electron_volt print(round(energy_ev, 3))

Cfrom scipy.constants import c, planck, electron_volt wavelength = 400 energy_joule = planck * c / wavelength energy_ev = energy_joule * electron_volt print(round(energy_ev, 3))

Dfrom scipy.constants import c, planck wavelength = 400e-9 energy_joule = planck * c * wavelength print(round(energy_joule, 3))

Step-by-Step Solution

Solution:

Step 1: Calculate photon energy in joules using E = h*c / wavelength
Use wavelength in meters (400e-9). Calculate energy_joule = planck * c / wavelength.
Step 2: Convert energy from joules to electronvolts
Divide energy_joule by electron_volt constant to get energy in eV.
Step 3: Check code correctness
from scipy.constants import c, planck, electron_volt wavelength = 400e-9 energy_joule = planck * c / wavelength energy_ev = energy_joule / electron_volt print(round(energy_ev, 3)) correctly imports electron_volt, converts units properly, and prints rounded value. Other options either miss conversion, use wrong wavelength units, or wrong formula.
Final Answer:
from scipy.constants import c, planck, electron_volt wavelength = 400e-9 energy_joule = planck * c / wavelength energy_ev = energy_joule / electron_volt print(round(energy_ev, 3)) -> Option B
Quick Check:
Energy (eV) = (h*c/wavelength)/electron_volt [OK]

Quick Trick: Convert joules to eV by dividing by electron_volt constant [OK]

Common Mistakes:

MISTAKES

Skipping conversion from joules to eV
Using wavelength in nm without converting to meters
Multiplying instead of dividing for energy calculation

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More SciPy Quizzes

You want to calculate the energy of a photon with wavelength 400 nm using scipy.constants. Which code snippet correctly computes and prints the energy in electronvolts (eV)?

Step 1: Calculate photon energy in joules using E = h*c / wavelength

Step 2: Convert energy from joules to electronvolts

Step 3: Check code correctness

Final Answer:

Quick Check:

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