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A light wave enters from air into glass. How will the energy of the wave be affected?
  • a)
    Decreases
  • b)
    Increases
  • c)
    Remains the same
  • d)
    Independent
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
A light wave enters from air into glass. How will the energy of the wa...
Impact of light wave entering from air into glass

Refraction of Light

When a light wave enters from air into glass, it undergoes refraction, which means the bending of the light wave as it passes through the glass. This is due to the change in speed of light in different media.

Change in Speed of Light

The speed of light in air is approximately 3 x 10^8 m/s, while the speed of light in glass is approximately 2 x 10^8 m/s. As a result, the light wave slows down when it enters the glass. This change in speed results in a change in the wavelength and frequency of the light wave.

Decrease in Energy

The energy of a light wave is directly proportional to its frequency. Therefore, as the frequency of the light wave decreases upon entering the glass, its energy also decreases. This is because energy is directly proportional to frequency and inversely proportional to wavelength.

Conclusion

In conclusion, when a light wave enters from air into glass, it undergoes refraction, which results in a decrease in its speed, wavelength, frequency, and energy. Therefore, option A, "Decreases," is the correct answer.
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Community Answer
A light wave enters from air into glass. How will the energy of the wa...
When a light wave enters from the air medium into the glass medium, the energy of the wave decreases because a part of the light wave is reflected in the air. Therefore, in this way, energy will be affected.
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Direction: Read the passage given below and answer the following questions:Boiling point or freezing point of liquid solution would be affected by the dissolved solids in the liquid phase. A soluble solid in solution has the effect of raising its boiling point and depressing its freezing point. The addition of non-volatile substances to a solvent decreases the vapour pressure and the added solute particles affect the formation of pure solvent crystals.According to many researches the decrease in freezing point directly correlated to the concentration of solutes dissolved in the solvent. This phenomenon is expressed as freezing point depression and it is useful for several applications such as freeze concentration of liquid food and to find the molar mass of an unknown solute in the solution. Freeze concentration is a high quality liquid food concentration method where water is removed by forming ice crystals. This is done by cooling the liquid food below the freezing point of the solution. The freezing point depression is referred as a colligative property and it is proportional to the molar concentration of the solution (m), along with vapour pressure lowering, boiling point elevation, and osmotic pressure. These are physical characteristics of solutions that depend only on the identity of the solvent and the concentration of the solute. The characters are not depending on the solute’s identity.Q.Colligative properties are

A light wave enters from air into glass. How will the energy of the wave be affected?a)Decreasesb)Increasesc)Remains the samed)IndependentCorrect answer is option 'A'. Can you explain this answer?
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