The photoelectric current is directly proportional to the number of photo electrons emitted per second. This implies that

In reference to the radio waves, choose the incorrect statements:
(A) Radio waves are the longest wavelength electromagnetic waves.
(B) Radio waves are deviated by electric and magnetic fields.
(C) Radio waves are diffracted easily.
(D) Radio waves are not electromagnetic waves.
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At what speed should a galaxy move with respect to earth so that spectral line of \( 600.0 \text{ nm} \) appears as \( 600.6 \text{ nm} \) ?

Four materials \(\mathrm{A}, \mathrm{B}, \mathrm{C}\) and D have the magnetic susceptibilities \(\chi_{m A}, \chi_{m B}, \chi_{m C}\) and \(\chi_{m D}\) respectively. which are related as \(\chi_{m D}<\chi_{m C}<\chi_{m B}<\chi_{m A}\). Which material can be magnetised with maximum ease?

Which of the following statements are correct?
A. Relative motion between a coil and a magnet induces the electric current.
B. The charges in motion can experience force due to a stationary magnet.
C. Mutual inductance of a pair of coils does not depend on their separation as well as their relative orientation.
D. Self inductance plays the role of inertia.
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A square shaped coil of 10 cm side, having 100 turns, is placed perpendicular to a magnetic field which is increasing at the rate of 1.0 T/s. The induced emf in the coil would be

The ratio of the radii of two nuclei of mass numbers \( A_1 \) and \( A_2 \) respectively would be

Read the passage carefully and answer the Questions
Haloalkanes undergo nucelophilic substitution reactions owing to the polarity of CX bond. The nucleophile reacts with the haloalkane on the carbon possessing a partial positive charge holding the halogen atom. The halogen atom X is replaced by a nucleophile. Depending on the kinetics and mode of bond breaking, the mechanism can be either SN1 or SN2 reaction. The rate of SN1 reaction is governed by the stability of carbocation and in SN2 reaction, the rate of reaction is governed by steric factor. Chirality is the main factor in both SN1and SN2. In SN1 reaction, the chirality of alkyl halide is accompanied by racemization of the product, while in SN2 reaction, the product is characterized by inversion of configuration. The structure of alkyl halide and the nature of the solvent also governs the mechanism of the substitution.
What is meant by the term racemic mixture?

Arrange the following compounds in increasing order of their reactivity towards nucleophilic addition reaction:
(A) Ethanal
(B) Propanal
(C) Propanone
(D) Butanone
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The area bounded by \(y^2=x, y=5\) and the \(y\)-axis is:

Match List I with List II.

LIST I	LIST II
A. Green Revolution	I. Corrective therapy of hereditary disease
B. Gene therapy	II. Increased yield and better management of improved crop varieties
C. Genetic Engineering Approval Committee	III. Mass production of safe and more effective therapeutics
D. Recombinant DNA techonologies	IV. Make decision to introduce GM organism for public service

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Which one of the following hormones is produced only during pregnancy?

\(0.01\) M aqueous solutions of following salts were prepared. Their conductivity values were measured at \(25°C\). Which of the following will possess highest conductivity at \(25°C\)?