Recent questions in Physics

What is the angular separation between two lines of $\lambda_1 =5882 \mathring{A}$ and $\lambda_2 =5852 \mathring{A}$ in first order grating with 6000 lines per cm in normal incidence.

asked Jan 23, 2014 by meena.p

1 answer

A thin film of oil of $\mu =1.2 $ floats on watch of $\mu_w =\large\frac{4}{3}$. A monochromatic light of wave length $\lambda= 9600 A^{\circ} $ falls normally and it appears dark. What must be minimum change in thickness of oil film which will appear bright if normally reflected by same light.

asked Jan 23, 2014 by meena.p

1 answer

The temperature at which the most probably speed of oxygen is equal to the rms velocity of hydrogen at NTP is?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

The temperature at which the velocity of Helium is four times the velocity of Hydrogen at NTP is?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

An ideal gas occupies a volume V at temperature T and pressure P. The mass of each molecule is m. The molar mass of the gas is M. Which of the following cannot be an expression for density of an ideal gas?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

An ideal gas occupies a volume V at temperature T and pressure P. The mass of each molecule is m. The molar mass of the gas is M. Then the temperature at which the sample of gas will weight m is given by which of the following options?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

An ideal gas occupies a volume V at temperature T and pressure P. The mass of each molecule is m. Then the number of molecules in the sample is?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

For an ideal gas, average kinetic energy per degree of freedom is?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

A bubble of an ideal gas is trapped in a liquid filled in a container. As the bubble moves upwards besides the buoyancy force, the forces acting on it are:

asked Jan 23, 2014 by balaji.thirumalai

1 answer

Which of the following quantities is larger for a diatomic has than that of a monoatomic gas?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

Given the following statements, choose the correct answer:

asked Jan 23, 2014 by balaji.thirumalai

1 answer

A Plastic film of thickness t is placed in the path of one of the interfering wave in the young's double slit experiment and it is found that the central fringe is displaced through a width of 5 fringes . If wavelength of light used is $5890 \mathring{A}$ What is thickness of film used

asked Jan 23, 2014 by meena.p

1 answer

Two waves from coherent sources $S_1$ and $S_2$ having wavelength $\lambda$ arrive at a point P and complete destructive interference takes place . The path difference between them is

asked Jan 23, 2014 by meena.p

1 answer

Two slit in a young's double slit experiment is separated by a distance d. The screen distance is D and it is illuminated by a light of wavelength $\lambda$. A point 0 on the screen is $\large\frac{2d}{3} $ distance from the point which is directly in front of one of the slits. How far away is 0 from the central bright fringe.

asked Jan 23, 2014 by meena.p

1 answer

Two coherent sources of light $S_1 $ and $S_2$ are placed in a line as shown. Two screens are placed perpendicular to $S_1S_2$ at A and B . It is observed that at point P a bright fringe is seen , then at point Q.

asked Jan 23, 2014 by meena.p

1 answer

Which of the following statements is true about an ideal gas?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

Which of the following statements is true about an ideal gas?

asked Jan 23, 2014 by balaji.thirumalai

0 answers

In a Young's double slit experiment at a point P on the screen the light from two slit with a path difference of $\large\frac{\lambda}{6} $ Where $\lambda$ is the wavelength of the incident light . The intensity of light at point P is I. If $I_0$ is maximum intensity then $\large\frac{I}{I_0}$

asked Jan 23, 2014 by meena.p

1 answer

A gas is found to obey the law $P =kV^{-2}$. The initial volume is $V_0$. If the gas expands to $4 V_0$ and if the initial temperature is $T_0$ what is its final temperature?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

A gas is found to obey the law $P =kV^a$. The initial temperature and volume are $V_0$. If the gas expands to $b V_0$ the sign of the internal energy change depends on which of the following? (Note: $\gamma$ is the adiabatic index)

asked Jan 23, 2014 by balaji.thirumalai

1 answer

In a young's double slit experiment 'd' distance between slit is $0.5\; mm$ and illuminated by light of $\lambda =6000 A^{\circ}$ If screen distance is 2.5m ,thedistance of third bright fringe from centre.

asked Jan 23, 2014 by meena.p

1 answer

A gas is found to obey the law $P^3V =$ constant. The initial temperature and volume are $T_0$ and $V_0$. If the gas expands to $2 V_0$ what happens to the internal energy?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

In a Young's double slit experiment light of $\lambda =5000\mathring{A}$ is incident on two slits. At a point P on the screen the two rays arriving have a path difference of $1 \times 10^{-6} \;m$. If the central fringe (zero) is maxima . What is formed at p.

asked Jan 23, 2014 by meena.p

1 answer

Maximum intensity of the interference pattern in a young double slit experiment is I. Distance between slit is $d= 5 \lambda$ where $\lambda $ is wave length of the light source. What will be the intensity of light at a point directly in front of one of the slits. $(D= 50 \lambda)$

asked Jan 23, 2014 by meena.p

1 answer

In a Young's double slit experiment 'd' distance between slit is $1 \times 10^{-4}\;m$ and $D=1\; m $. ( distance of screen from slits ) At a point P on the screen the resulting intensity is equal to the intensity due to individual slit $I_0$ The distance of P from central maxima when wavelength of $x=6000\;\mathring{A}$ is

asked Jan 23, 2014 by meena.p

1 answer

A polariser and an analyser are oriented so that maximum light is transmitted of intensity $I_0$ What will be the intensity of the out coming light when analyer is rotated through $60^{\circ}$

asked Jan 23, 2014 by meena.p

1 answer

In a single slit experiment a wave of wavelength $0.2 \;cm$ is incident normally on a slit of width $0.004\;m$ . What is the semi angular width of the central maxima.

asked Jan 23, 2014 by meena.p

1 answer

The first diffraction minima due to a single diffraction is at $30^{\circ}$ for a light of wave length $5000A^{\circ}$ the width of slit is

asked Jan 23, 2014 by meena.p

1 answer

The maximum distance a person having defect of short right can see clearly is 4 meters. The power of lens required to correct is

asked Jan 23, 2014 by meena.p

1 answer

In Young's double slit experiment if width of slit is made 3 folds, the fringe width becomes

asked Jan 23, 2014 by meena.p

1 answer

The contrast in the dark and bright fringes in any interference pattern depends on

asked Jan 23, 2014 by meena.p

1 answer

A double convex lens $(\mu =1.5) $ has its focal length 10 cm. What will be its focal length if it is immersed in liquid of $(\mu_1=\large\frac{4}{3})$

asked Jan 23, 2014 by meena.p

1 answer

The objective of a telescope has a diameter 5 cm. What is the angular seperation in radius of two starts which can be resolved by the telescope when light of $3000 A^{\circ}$ is used.

asked Jan 23, 2014 by meena.p

1 answer

In a thermodynamic process, neon obeys the law $TP^{\large\frac{2}{5}}$ = constant. If the temperature of 2 moles of gas is raised from T to 5T, then the heat given to gas (consider ideal behaviour) is what?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

The magnifying power of telescope is 9. when it is adjusted for parallel rays, the distance between objective and eye piece is found to be 20 cm. The focal length of lenses are

asked Jan 23, 2014 by meena.p

1 answer

In a thermodynamic process, an ideal monoatomic gas follows the law $TP^{\large\frac{3}{5}} = $ constant. If temperature of 2 moles of gas is raised from T to 4 T, then what is the heat given to the gas?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

If a gas is made to expand in such a way that pressure increases and its final and initial volumes are equal then which of the following statements must be true?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

Light is incident at $30^{\circ}$ on one side of a right angled isosceles prism of $\mu =\large\frac{3}{2}$. What will be the angle of emergence.

asked Jan 23, 2014 by meena.p

1 answer

If a gas is made to expand in such a way that its final and initial pressure are equal then which of the following statements cannot be true?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

A gas is made to expand in such a way that its final and initial temperatures are equal and also the process followed by the gas traces a straight line of the PV diagram. Then, which of the following statements is true?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

The temperature versus volume of an ideal gas is shown below.

asked Jan 22, 2014 by balaji.thirumalai

1 answer

Pressure versus Temperature graph of an ideal gas is shown below. Then which of the options that follow forms the corresponding P-V Diagram?

asked Jan 22, 2014 by balaji.thirumalai

1 answer

A 150m long train is moving with uniform velocity of 45km / h. The time taken by train to cross the bridge of length 850m is ?

asked Jan 22, 2014 by balaji.thirumalai

1 answer

Which of the following quantities depend on temperatures only for a given ideal gas?

asked Jan 22, 2014 by balaji.thirumalai

1 answer

Which of the following quantities depend on temperatures only for a given ideal gas?

asked Jan 22, 2014 by balaji.thirumalai

1 answer

The molar heat capacity for an ideal gas is?

asked Jan 22, 2014 by balaji.thirumalai

1 answer

Which of the following statements is false about the molar heat capacity of the ideal gas?

asked Jan 22, 2014 by balaji.thirumalai

1 answer

Which of the following quantities is independent of the nature of gas at the same temperature?

asked Jan 22, 2014 by balaji.thirumalai

1 answer

The quantity $\large\frac {mRT^2}{\rho}$ of an ideal gas is proportional to the:

asked Jan 22, 2014 by balaji.thirumalai

2 answers

Internal energy of a system remains constant when it undergoes?

asked Jan 22, 2014 by balaji.thirumalai

1 answer

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