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examples of dawn of modern physics @ candle academy Pakistan.
in lecture 22 of chapter 18 dawn of modern physics for class 12 Federal board and kpk board, book examples 18.1, 18.2, 18.3, 18.4, and 18.5 are solved.

Example 18.1
The rest mass of an electron is 9.11 ×10 ^-31 kg calculate the corresponding rest energy.

Example 18.2
Spaceship is measured hundred metre long while it is at rest with respect to an observer. If this spaceship now flies by the observer with a speed of .99 c. Find its length.

Example 18.3
Superman, who has an exceptionally strong arm, throws a fast ball with a speed of 0.9 c. If the rest mass of the ball is 0.5 kg, what is its mass in flight?

Example 18.4
The temperature of the skin is approximately 35°C. What is the wavelength at which peak occurs in the radiation emitted from the skin?

Example 18.5
Sodium surface is illuminated with light of wavelength 300nm. The work function for the sodium is 2.4 eV. Find
a. Kinetic energy of the ejected electrons
b. The cutoff wavelength for sodium

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