scipy.constants module - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of accessing a physical constant

What is the output of this code snippet using scipy.constants?

SciPy

from scipy.constants import speed_of_light
print(round(speed_of_light, 1))

A 3.0e8

B 299792458.0

C 299792.458

D 299792458

💡 Hint

The speed of light constant is given in meters per second as an integer value.

The speed_of_light constant in scipy.constants is defined as an integer value representing meters per second. Using round on an integer returns a float, so the output is 299792458.0.

❓ data_output

intermediate

Number of constants in a dictionary

How many physical constants are included in the dictionary returned by scipy.constants.physical_constants?

SciPy

from scipy.constants import physical_constants
print(len(physical_constants))

A 100

B 90

C 74

D 84

💡 Hint

Count the keys in the dictionary of physical constants.

The physical_constants dictionary in scipy.constants contains 74 entries representing various physical constants.

🧠 Conceptual

advanced

Understanding units in scipy.constants

Which of the following statements about the units of constants in scipy.constants.physical_constants is correct?

A Units are stored as separate variables outside the dictionary.

B All constants are given only in SI base units without any unit names.

C Constants are stored as simple floats without unit information.

D Each constant is a tuple containing the value, unit string, and uncertainty.

💡 Hint

Check the structure of the values in the physical_constants dictionary.

Each entry in physical_constants is a tuple with three elements: the numerical value, the unit as a string, and the uncertainty of the value.

🔧 Debug

advanced

Error raised by incorrect import

What error will this code raise?

SciPy

from scipy.constants import speed_of_lightt
print(speed_of_lightt)

A ImportError

B AttributeError

C ModuleNotFoundError

D NameError

💡 Hint

Check the spelling of the imported constant.

The import statement tries to import speed_of_lightt which does not exist in scipy.constants. This causes an ImportError.

🚀 Application

expert

Calculate energy equivalent of 1 kg mass using scipy.constants

Using scipy.constants, which option correctly calculates the energy equivalent (in joules) of 1 kilogram mass using Einstein's equation E=mc²?

SciPy

from scipy.constants import speed_of_light
mass = 1  # in kilograms
energy = ???
print(energy)

A mass * speed_of_light ** 2

B mass * (speed_of_light * 2)

C mass * speed_of_light * speed_of_light

D mass ** 2 * speed_of_light

💡 Hint

Remember the formula E = m times c squared.

The energy equivalent is calculated by multiplying mass by the square of the speed of light: E = m * c². Option A correctly implements this.