[Solved] What will be the output of this code snippet?from scipy.constants import c, planck wavelength = 400e-9 energy = planck * c / wavelength print(round(energy, 2)) | SciPy

SciPy - Constants and Special Functions

What will be the output of this code snippet?

from scipy.constants import c, planck
wavelength = 400e-9
energy = planck * c / wavelength
print(round(energy, 2))

A4.97e-22

B4.97e-16

C4.97e-19

D4.97e-17

Step-by-Step Solution

Solution:

Step 1: Identify constants and units
planck is Planck's constant in J·s, c is speed of light in m/s, wavelength is 400 nm = 400e-9 m.
Step 2: Calculate energy
Energy = planck * c / wavelength ≈ 6.62607015e-34 * 299792458 / 400e-9 ≈ 4.97e-19 J.
Step 3: Round output
Rounding 4.97e-19 to 2 decimals in scientific notation gives 4.97e-19, which matches 4.97e-19.
Final Answer:
4.97e-19 -> Option C
Quick Check:
Energy inversely proportional to wavelength [OK]

Quick Trick: Energy = planck * c / wavelength in joules [OK]

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