Monochromatic light of wavelength 600 nm is incident from air on to water surface. The frequency of refracted light is

X-rays of wavelength, \(\lambda=r{A}\) have frequency :

From the following, choose the element for impurity atoms with which pure silicon should be doped to make it a p-type semiconductor:

Three equal resistors connected in series across a source of emf together dissipate 9 W of power. What would be the power dissipated if the same resistors are connected in parallel across the same source.

The energy of a photon of wavelength \( \lambda \) is

A monochromatic source emitting light of wavelength 300 nm has a power output of 33 W.
Calculate the number of photons emitted by this source in 2 minutes. (\( h = 6.62 \times 10^{-34} \text{ J s} \))

A short bar magnet placed with its axis at \(30^\circ\) with a uniform external magnetic field of 0.16 T experiences a torque of magnitude 0.48 J. The magnetic moment of the bar magnet will be

When the angle of incidence on a material is \(60^{\circ}\), the reflected light is completely polarised. The velocity of the refracted ray inside the material in cm/s is :

Read the passage carefully. Attempt the questions.
In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of these regulatory mechanisms. Cancerous cells just continue to divide giving rise to masses of cells called tumors. Benign tumors normally remain confined to their original location. The malignant tumors, on the other hand are a mass of proliferating cells. These cells actively divide and starve the normal cells by competing for vital nutrients. Cells sloughed from such tumors reach distant sites through blood, and wherever they get lodged in the body, they start a new tumor there. This property is called metastasis. Transformation of normal cells into cancerous cells may be induced by physical, chemical or biological agents called carcinogens.
Normal cells show a property that does not allow their uncontrolled growth. This property is known as:

In an experiment on the photoelectric effect, the slope of the cut-off voltage versus frequency of the incident light gives

For the given five values, \(16,25,19,34,43\), the three year moving averages are

Arrange the steps followed during nucleophilic addition on a carbonyl group.
A. \(s p^2\) hybridised carbon of \(>C=O\) group changes to \(s p^3\) hybridised carbon
B. Nucleophile attacks the electrophilic carbon
C. Tetrahedral alkoxide ion is formed
D. Intermediate captures \(H ^{+}\)to give neutral product.
Choose the correct answer from the options given below:

Arrange the following compounds in increasing order of their basicity
(A) Aniline
(B) p-Nitroaniline
(C) p-Toluidine
(D) p-Methoxyaniline
Choose the correct answer from the options given below: