Potential series for class 11 in Gujarati
Potential series. Ch. 11 COMIC SECTION
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GUJCET Physics Study Materials & Question Banks
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Top 15 habits we had in our life for great life and great relationship
These things we add in our habits for great life 1) I am always be a Proactive. 2) I am do talk less and work more. 3) I am always read news in 20 to 25 minutes. 4) Make simply communicate with anyone. 5)Always do a important work first. 6) Work as a team. 7) Stand up straight with our shoulder back. 8) Make group good friends because we are average our friends. 9) Compare ourselves to Who We Were yesterday ,not with someone else. 10)Tell the truth at least don't lie. 11) assume that the person who we are listening to my new something we don't know. 12)Be precise on our speech. 13)Work 1.5x from our previous version. 14) Make time for exercise 15) Invest in self-care
LASER
LASER * Usefulness of Einstein’s coefficients in construction of laser : (1) The rate of stimulated emission must be as large as possible compared to the rate of spontaneous emission. i.e (𝑹𝟐𝟏)𝒔𝒑 (𝑹𝟐𝟏)𝒔𝒕 < < 1 Now , (𝑹𝟐𝟏)𝒔𝒑 (𝑹𝟐𝟏)𝒔𝒕 = 𝑨𝟐𝟏 𝑵𝟐 𝑩𝟐𝟏 𝑵𝟐 𝝆 ( 𝝂 ) = 𝒄 𝟑 𝟖 𝝅 𝒉 𝒇 𝟑 [ 𝒆 𝒉 𝒇 𝑲 𝑻 − 𝟏] 𝟖 𝝅 𝒉 𝒇 𝟑 𝒄 𝟑 ∴ (𝑹𝟐𝟏)𝒔𝒑 (𝑹𝟐𝟏)𝒔𝒕 = 𝒆 𝒉 𝒇 𝑲 𝑻 − 𝟏 Thus, from the above eqn. we can see that at normal temperature the value of frequency ( f ) must be small . (2) The ratio of the rate of stimulated emission to the rate of absorption should be as large as possible . i.e (𝑹𝟐𝟏)𝒔𝒕 (𝑹𝟏𝟐)𝒂𝒃 ≥ 𝟏 ∴ (𝑹𝟐𝟏)𝒔𝒕 (𝑹𝟏𝟐)𝒂𝒃 = 𝑩𝟐𝟏 𝑵𝟐 𝝆 ( 𝝂 ) 𝑩𝟏𝟐 𝑵𝟏 𝝆 ( 𝝂 ) = 𝑵𝟐 𝑵𝟏 ( 𝑩𝟐𝟏 𝑩𝟏𝟐 = 𝟏 ) ∴ (𝑹𝟐𝟏)𝒔𝒕 (𝑹𝟏𝟐)𝒂𝒃 = 𝒆 − 𝒉 𝒇 𝑲 𝑻 From the above equation we can conclude tha...