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Questions asked by meena.p
Questions
14353
questions
1
answer selected
A bulb emits light of wavelength $4500\;A$ . The bulb is rated as $150\;walt$ and $8\%$ of the energy is emitted as light. How many photons are emitted by the bulb per second .
sat
chemistry
atomic-structure
asked
Jul 30, 2018
1
answer
A certain particle carries $2.5 \times 10^{-16}\;C$ of static electric charge. Calculate the number of electrons present in it .
sat
chemistry
atomic-structure
asked
Jul 30, 2018
1
answer
The electron of the same orbitals can be distinguished by
sat
chemistry
atomic-structure
asked
Jul 27, 2018
1
answer
Find the wavelength of 100 g particle moving with velocity $100 ms^{-1}$
sat
chemistry
atomic-structure
asked
Jul 27, 2018
1
answer
A moving electron has $5 \times 10^{-25}$ joules of kinetic energy. What is the de-Brogile wavelength ?
sat
chemistry
atomic-structure
asked
Jul 27, 2018
1
answer
Sodium street lamp gives off a characteristic yellow light of wave length $588\;nm$ calculate the energy mole (in KJ/mol) of these photons .
sat
chemistry
atomic-structure
asked
Jul 27, 2018
1
answer
Calculate the wave number for the shortest wavelength transition in the Balmer series of atomic hydrogen .
sat
chemistry
atomic-structure
asked
Jul 27, 2018
1
answer
Calculate the wavelength and energy of radiation emitted for the electronic transition from infinity to stationary state on of the hydrogen atom .
sat
chemistry
atomic-structure
asked
Jul 27, 2018
1
answer
Maximum number of electrons in a subshell with $f=3$ and $n=4$
sat
chemistry
atomic-structure
asked
Jul 26, 2018
1
answer
If $n=6$, the correct sequence for filling of electrons will be
sat
chemistry
atomic-structure
asked
Jul 26, 2018
1
answer
The total number of atomic orbitals in fourth energy level of an atom is
sat
chemistry
atomic-structure
asked
Jul 26, 2018
1
answer
The correct set of four quantum number for the valence electron of rubidium atom $(Z=37)$ is :
sat
chemistry
atomic-structure
asked
Jul 26, 2018
1
answer
The ratio of the difference in energy between the first and second Bohr orbit to that between the second and the third Bohr orbit is
sat
chemistry
atomic-structure
asked
Jul 26, 2018
1
answer
If the quadratic eqaution $y= 3(x+5)^2+12$ is written in the standard form what is the value of $c$ ?
sat
math
quadratic-equations
asked
Jul 26, 2018
1
answer
Which of the following are the roots of the equation $x^2+8x+12=0$ ?
sat
math
quadratic-equations
asked
Jul 26, 2018
1
answer
If $x=-2$ when $x^2-2px+p^2=0$ what is the value of $p$ ?
sat
math
quadratic-equations
asked
Jul 26, 2018
1
answer
The factored form of a quadratic polynomial is $y=(2x-3)(x+5)$. What are the solutions to the equation $y = 0$ ?
sat
math
quadratic-equations
asked
Jul 26, 2018
1
answer
If $x^2-x=30$, what is the value of $x-2$?
sat
math
quadratic-equations
asked
Jul 26, 2018
1
answer
If $2x-5 \sqrt x+9=16$ then $5 \sqrt x-15=$
sat
math
quadratic-equations
asked
Jul 26, 2018
1
answer
The equation $\large\frac{1}{4}$$(4x^2-8x-p)=132$, is satisfied. When $x=+8$ and $x=-6$. What is the value of $\large\frac{p}{4}$ ?
sat
math
quadratic-equations
asked
Jul 26, 2018
1
answer
Which one of the following ions has electronic configuration $[Ar]3d^6?$
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
Deuterium nucleus contains
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
Calculate the Broglie wavelength of an electron moving with 1% of the speed of light ?
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
The uncertainty in the position of a moving bullet of mass 10 g is $10^{-5}\;m$. Calculate the uncertainty in its velocity ?
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
Calculate wave number of yellow radiations having wavelength of $5800\; A_0$ .
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
Which of the following is not permissible arrangement of electrons in an atom ?
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
Maximum number of electrons in a subshell of an atom is determined by the following
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
If uncertainty in position and momentum are equal, then uncertainity in velocity is
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
Given : The mass of electron is $9.11 \times 10^{-31}\;kg$ . Planck constant is $6.626 \times 10^{-34}\;Js$ the uncertainty involved in the measurement of velocity within a distance of $0.1\;A$ is :
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
The orientation of an atomic governed by
sat
chemistry
atomic-structure
asked
Jul 25, 2018
1
answer
What will be the sum of values of x in the equation $16^x-10(4)^x+16=0$ ?
sat
math
quadratic-equations
asked
Jul 24, 2018
1
answer
Solve for x: <br> <br>$\qquad \qquad \qquad 2(x+2)^2=3x-5$
sat
math
quadratic-equations
asked
Jul 24, 2018
1
answer
If $18x^2=39x+84$, what can be the possible values of x.
sat
math
quadratic-equations
asked
Jul 24, 2018
1
answer
If $\large\frac{x^2-x}{x-1}$$=1$ what are the possible values of $x$ are :
sat
math
quadratic-equations
asked
Jul 24, 2018
1
answer
Simplify the rational expression :<br> <br> $\qquad \qquad \qquad \large\frac{6k^2-18k-24}{2k+2} $
sat
math
quadratic-equations
asked
Jul 24, 2018
1
answer
$36x^2-12x-15=0$ solve for $x$
sat
math
quadratic-equations
asked
Jul 24, 2018
1
answer
Given $x^2-5x+6=0$ and $x+k=4$ find the value of k.
sat
math
quadratic-equations
asked
Jul 24, 2018
1
answer
Solve<br> <br> $\qquad \qquad \qquad 2x^2+7x-9=0$
sat
math
quadratic-equations
asked
Jul 24, 2018
1
answer
When electrons are passed through electromagnetic field, electrons are deflected away from
sat
chemistry
atomic-structure
asked
Jul 23, 2018
1
answer
$Mg^{2+}$ is isoelectronic with
sat
chemistry
atomic-structure
asked
Jul 23, 2018
1
answer
Identify the wrong statement in the following
sat
chemistry
atomic-structure
asked
Jul 23, 2018
1
answer
Find energy of each of the photons which correspond to light of frequency $3× 10^{15}\; Hz.$
sat
chemistry
atomic-structure
asked
Jul 23, 2018
1
answer
Write the complete symbol for the atom with the given atomic number (Z) and Atomic mass (A) $Z = 92, A = 233$
sat
chemistry
atomic-structure
asked
Jul 23, 2018
1
answer
If $\bigg(p+\large\frac{a}{v^2}\bigg)$$(v-b)=RT$</br>$where\; P=pressure,V=volume,R=gas \;constant, T=temperature$ <br>Then find dimension of a and b?
cbse11
physics
asked
Jul 11, 2018
1
answer
In a right angled triangle, one of the angles measure $x^{\circ}$ If $\sin x^{\circ}=\large\frac{\sqrt 3}{2}$ . What is $\cos(90-x)$ ?
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
In a triangle $PQR$ right angled at $Q$, $QR=12\;cm$ and $PR=20\;cm$ . Triangle $ABC$ is similar to triangle $PQR$ where the vertices P,Q and R are corresponding to the vertices A,B and C. Each side of $\Delta ABC$ is $\large\frac{1}{4}$ the length of the corresponding slides of $\Delta PQR$. What is the value of $\sin C$ ?
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
A building $A,B$ is 40 m long. It cuts the shadow that is as long as the building then what is an angle $x$ in the given figure below?
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
If $x$ is an angle such that $0< x<90^{\circ}$, which of the following statements is not always true?
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
Simplify $(3i)^9$
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
Simplify $(2+3i)(1-i)$
sat
math
trigonometry
asked
Jul 9, 2018
1
answer
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