ZERO LEVEL BASIC CLASS - L2

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The energies of three conservative energy levels L_3,L_2 and L_1 of hydrogen atom are E_0 . (4E_0)/9 and E_0/4 respectively. A photon of wavelength lambda is emitted for a transition L_3 to L_1 .What will be the wavelength of emission for transition L_2 to L_1 ?

Three energy levels L_1,L_2 and L_3 of a hydrogen atom correspond to increasing values of energy i.e., E_(L_1) lt E_(L_2) lt E_(L_3) . If the wavelength corresponding to the transitions L_3 to L_2, L_2 to L_1 and L_3 to L_1 are lambda_3, lambda_2 and lambda_1 respectively then

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Let l be the lower class limit of a class-interval in a frequency distribution and m be the mid-point of the class. Then, the upper class limit of the class is m+(l+m)/2 (b) l+(m+1)/2 (c) 2m-l (d) (m-2l)

The intensity level of a sound of intensity of 10^(-12)wat t//cm^(2) is 40 dB. What is the zero level of intensity ?

Calculate average number of marks by student in a class. Note: It is inclusive class case with lower limit of the first class is zero.

The wavelength of radiation emitted due to transition of electron from energy level E to zero is equal to lamda . The wavelength of radiation (lamda_(1)) emitted when electronjumpsfrom energy level (3E)/(2) to zero will be :