Recent questions tagged ch2

calculate the Broglie wavelength of an electron moving with 1% of the speed of light ?

asked May 16, 2019 by meena.clay6

1 answer

What is common between $d_{xy}$ and $d_{x2-y2}$ orbitals ?

asked May 16, 2019 by meena.clay6

1 answer

Calculate energy of 2 moles of photons of radiation whose frequency is $5 \times 10^{34}\;Hz$

asked May 16, 2019 by meena.clay6

1 answer

What is relative mass and charge of an electron?

asked May 15, 2019 by meena.clay6

1 answer

Define the term scintillations?

asked May 15, 2019 by meena.clay6

1 answer

Why some atoms shows radioactivity?

asked May 15, 2019 by meena.clay6

1 answer

A particle has an initial velocity $3 \hat{i} + 4 \hat{j}$ and an acceleration of $0.4 \hat{i} + 0.3 \hat{j}$. Its speed after 10 s is

asked Nov 29, 2018 by pady_1

1 answer

The value of Planck's constant is $6.63 \times 10^{-34} Js$. The speed of light is $3 \times 10^{17} nms^{-1}$. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of $6 \times 10^{15} s^{-1}$ ?

asked Aug 20, 2018 by pady_1

1 answer

Find energy of each of the photons which correspond to light of frequency $3\times 10^{15}Hz$.

asked Jul 19, 2018 by swapnarajan1982

1 answer

Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of ${_6}C^{12}$

asked Jul 17, 2018 by swapnarajan1982

1 answer

A boat is sent across a river with a velocity of 8km /h if the resultant velocity of boat is 10km /h then velocity of the river is

asked Jul 29, 2017 by ahirj714

1 answer

Embryosac of some apomictic species appear normal but come from diploid cells. Suggest a suitable ex

asked Jun 14, 2017 by pady_1

1 answer

Embryosac of some apomictic species appear normal but come from diploid cells. Suggest a suitable ex

asked Jun 14, 2017 by pady_1

1 answer

Embryosac of some apomictic species appear normal but come from diploid cells. Suggest a suitable ex

asked Jun 14, 2017 by pady_1

1 answer

What are the possible types of  pollinations in chasmogamous flowers. Give reasons.

asked Jun 13, 2017 by pady_1

1 answer

The generative cell of two - celled pollen divides in the pollen tube but not in a three celled poll

asked Jun 13, 2017 by pady_1

1 answer

Why does the zygote begin to divide only after the division of Primary Endosperm Cell?

asked Jun 13, 2017 by pady_1

1 answer

Are parthenocarpy and apomixes different phenomenon? Discuss their benefits.

asked Jun 13, 2017 by pady_1

1 answer

Does self incompatibility impose any restrictions on autogamy? Give reasons and suggest method of po

asked Jun 13, 2017 by pady_1

1 answer

Does self incompatibility impose any restrictions on autogamy? Give reasons and suggest method of po

asked Jun 13, 2017 by pady_1

1 answer

Vivipary automatically limits the number of offsprings in a litter. How?

asked Jun 13, 2017 by pady_1

1 answer

Given below are the events that are observed in an artificial hybridization programme. Arrange them

asked Jun 13, 2017 by pady_1

1 answer

<div>What is the function of two male gametes produced by each pollen grain in angiosperms?</div>

asked Jun 13, 2017 by pady_1

1 answer

How is pollination carried out in water plants?

asked Jun 13, 2017 by pady_1

1 answer

Which is a triploid tissue in a fertilized ovule? How is triploid condition achieved?

asked Jun 12, 2017 by pady_1

1 answer

Name the type of pollination in self incompatible plants.

asked Jun 12, 2017 by pady_1

1 answer

What is self incompatibility?

asked Jun 12, 2017 by pady_1

1 answer

Can an unfertilized egg, apomictic embryosac give rise to diploid embryo? If yes, then how?

asked Jun 12, 2017 by pady_1

1 answer

In case of polyembryony, if an embryo develops from synergid and another from the nucellus which is

asked Jun 12, 2017 by pady_1

1 answer

Name the part of the pistil which develop into fruits and seeds.

asked Jun 12, 2017 by pady_1

1 answer

Name the common function that cotyledons and nucellus perform.

asked Jun 12, 2017 by pady_1

1 answer

Name the part of the gynoecium that determines the compatible nature of the pollen grain.

asked Jun 12, 2017 by pady_1

1 answer

Name the component cells of the 'egg apparatus' in the embryo sac.

asked Jun 12, 2017 by pady_1

1 answer

Explain the structure of a typical angiospermic anther.

asked Jun 9, 2017 by pady_1

1 answer

What are the properties of lines of forces ?

asked May 15, 2017 by pady_1

1 answer

write applications of superconductors

asked May 12, 2017 by anonymous

1 answer

How much ethyl alcohol must be added to 1 litre of water so that the solution will freeze at $14^{\circ}F$ ? ($K_f$ for water = $1.86^{\circ}C/mol)$

asked Dec 29, 2016 by sharmaaparna1

1 answer

Out of (a) 200 ml of 2 M NaCl Soln and (b) 200 ml of 1 M glucose Soln. which one has higher osmotic pressure ?

asked Dec 29, 2016 by sharmaaparna1

1 answer

Evaluate : $\tan \begin{bmatrix} \frac{\pi}{4} + \frac{1}{2} \cos^{-1} \frac{a}{b} \end{bmatrix} + \tan \begin{bmatrix} \frac{\pi}{4} - \frac{1}{2} \cos^{-1} \frac{a}{b} \end{bmatrix}$

asked Dec 21, 2016 by priyanka.c

1 answer

Find the value of $\tan^{-1} (\frac{x}{y}) - \tan^{-1}(\frac{x-y}{x+y})$

asked Nov 30, 2016 by priyanka.c

1 answer

Evaluate : $\tan \frac{1}{2} (\cos^{-1} \frac{\sqrt 5}{3})$

asked Nov 22, 2016 by priyanka.c

1 answer

Evaluate $tan^{-1} (\frac{\cos x}{1-\sin x}), \;\; \; -\frac{\pi}{2} < x < \frac{\pi}{2}$

asked Nov 20, 2016 by priyanka.c

1 answer

Differentiate $\tan^-1 \frac{[\sqrt{1+x^2} + 1}{x}], x \neq 0$

asked Nov 18, 2016 by priyanka.c

1 answer

If $\cos^{-1} x + cos^{-1} y + cos^{-1} z = \pi $ , Evaluate $x^2 + y^2 + z^2 + 2xyz$

asked Nov 17, 2016 by priyanka.c

1 answer

$\tan ^{-1}x +\tan^{-1} \frac{2x}{1-x^2} = 3 \tan ^{-1}(x) \;, |x| < \frac{1}{\sqrt 3}$ . Is this true ? Justify.

asked Nov 16, 2016 by priyanka.c

1 answer

Find using distributive property: $58 \times 101$

asked Aug 2, 2016 by meena.p

1 answer

If the product of two whole numbers is zero, can we say that one or both of them will be zero?

asked Aug 2, 2016 by meena.p

1 answer

A vendor supplies 32 litres of milk to a hotel in the morning and 68 litres of milk in the evening. If the milk costs Rs 15 per litre, how much money is due to the vendor per day?

asked Aug 2, 2016 by meena.p

1 answer

Simplify : $75 \times 56 +25 \times 56$

asked Aug 2, 2016 by meena.p

1 answer

The canteen charges Rs 50 for lunch and Rs 20 for milk for each day. How much money do you spend in 5 days on these things?

asked Aug 2, 2016 by meena.p

2 answers

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