We can only apply the L’Hospital’s rule if the direct substitution returns an indeterminate form, that means .

The graph shown in the adjacent diagram, represents the variation of temperature T of two bodies x and y having same surface area, with time (t) due to emission of radiation. Find the correct relation between emissive power(E) and absorptive power(a) of the two bodies

Two circular disc A and B with equal radii are blackened. They are heated to same temperature and are cooled under identical conditions. What inference do you draw from their cooling curves (R is rate of cooling)

A block of steel heated to 100C is left in a room to cool. Which of the curves shown in the figure, represents the correct behaviour

Cooling graphs are drawn for three liquids a,b and c The specific heat is maximum for liquid

Absorptive power of a white body and of a perfectly black body respectively are

The energies E₁ and E₂ of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e. λ and λ will be:

The first Lyman transition in the hydrogen spectrum has ΔE =10.2 eV. The same energy change is observed in the second Balmer transition of -

Which of the following substance will have highest b.p.t.?

Which of the following has the lowest melting point-

The electronic structure of four elements a,b,c and d are a=1s²,b =1s²,2s²2p²,c =1s²2s²2p⁵,d=1s² 2s²2p⁶ The tendency to form electrovalent bond is greatest in-

In which of the following pair the boilling point of first compound is not more than the second:

Compound of a metal ‘M’ is M₂O₃. The formula of its nitride will be-

The compound formed by which of the following pair of ions will have lowest melting
point:

Formula of a metal oxide is MO, formula of its phosphate will be-