Tags Physics

Physics

Get insights from 5.6k questions on Physics, answered by students, alumni, and experts. You may also ask and answer any question you like about Physics

Follow Ask Question

5.6k

Questions

Discussions

Active Users

Followers

New answer posted

6 months ago

Physics Physics Wave Optics

Using Young's double slit experiment, a monochromatic light of wavelength 5000 $\overset{o}{A}$ produces fringes of fringe width 0.5mm. If another monochromatic light of wavelength 6000 $\overset{o}{A}$ is used and the separation between the slits is doubled, then the new fringe width will be:

0 Follower 2 Views

alok kumar singh

Contributor-Level 10

$β_{1} = \frac{λ_{1} D_{1}}{d_{1}}$

$β_{2} = \frac{λ_{2} D_{2}}{d_{2}}$

$\frac{β_{1}}{β_{2}} = \frac{λ_{1}}{d_{1}} * \frac{d_{2}}{λ_{2}}$

$\frac{0.5}{β_{2}} = \frac{5000 * d_{1}}{d_{1} * 600}$

$β_{2} = \frac{0.5 * 6}{10}$

2 = 0.3mm

0 0

New answer posted

6 months ago

Physics Physics Electrostatic Potential and Capacitance

A positive charge particle of 100mg is thrown in opposite direction to a uniform electric field of strength 1 * 10⁵ NC^-1, If the charge on the particle is $40 μ C$ and the initially velocity is 200 ms^-1, how much distance it will travel before coming to the rest momentarily:

0 Follower 4 Views

alok kumar singh

Contributor-Level 10

a = $\frac{q E}{m} = \frac{40 * 1 0^{? 6} * 1 0^{5}}{100 * 1 0^{? 3} * 1 0^{? 3}}$

= 40 * 10³ m/sec²

v² = u² + 2a s

$? 0 = {(200)}^{2} ? 2 * 40 * 1 0^{3} s$

$s = \frac{200 * 200}{2 * 40 * 1 0^{3}} = 0.5 m$

0 0

View All 2 Answers

New answer posted

6 months ago

Physics Physics Electrostatic Potential and Capacitance

A parallel plate capacitor filled with a medium of dielectric constant 10, is connected across a battery and is charged. The dielectric slab is replaced by another slab of dielectric constant 15. Then the energy of capacitor will:

0 Follower 2 Views

alok kumar singh

Contributor-Level 10

UI= $\frac{1}{2} c v^{2}$

$U_{i} = \frac{1}{2} \frac{\in_{0} A}{d} * k v^{2}$

$U_{i} = \frac{1}{2} \frac{\in_{0} A}{d} * 10 v^{2}$

$U_{f} = \frac{1}{2} \frac{\in_{0} A}{d} * 15 v^{2}$

$\frac{U_{f}}{U_{i}} = \frac{3}{2}$

$\frac{U_{f} - U_{i}}{U_{i}} * 100 = (\frac{3}{4} - 1) * 100$

$\frac{1}{2} * 100$

0 0

New answer posted

6 months ago

Physics Waves

A longitudinal wave is represented by x = 10 sin 2p $(n t - \frac{x}{λ}) c m .$ The maximum particle velocity will be four times the wave velocity if the determined value of wavelength is equal to:

0 Follower 1 View

alok kumar singh

Contributor-Level 10

x = 10 $2 ? (n t ? \frac{x}{?}) c m$

V (wave velocity) = $\frac{? ?}{2 ?}$

v_max = 10 * 2p n

10 * 2pn = 4 * $\frac{? ?}{2 ?}$

10 * 2pn = $4 \frac{2 ? ? n ?}{2 ?}$

x = 5?

0 0

New answer posted

6 months ago

Physics Magnetism and Matter

At a certain place the angle of dip is 30° and the horizontal component of earth's magnetic field is 0.5 G. The earth's total magnetic field (in G), at the certain place, is:

0 Follower 2 Views

alok kumar singh

Contributor-Level 10

$B c o s δ = B_{H}$

B cos 30° = 0.5

$B = \frac{0 . * 2}{\sqrt[]{3}} = \frac{1}{\sqrt[]{3}}$

0 0

New answer posted

6 months ago

Physics Gravitation

The escape velocity of a body on a planet 'A' is 12 kms^-1. The escape velocity of the body on another planet 'B', whose density is four times and radius is half of the planet 'A', is:

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

$M_{A} = ρ_{A} * \frac{4}{3} π R_{A}^{3}$ $ρ_{B} = 4 ρ_{A}$

$M_{B} = ρ_{B} * \frac{4}{3} π R_{B}^{3}$ $R_{B} = \frac{R_{A}}{2}$

$\frac{M_{A}}{M_{B}} = 2, \frac{R_{A}}{R_{B}} = 2$ $\frac{V_{E A}}{V_{E B}} = \sqrt[]{\frac{2 G_{1} M_{A}}{R_{A}} * \frac{R_{B}}{2 G_{1} M_{B}}}$

$v_{E A} = v_{E B} = 12 k m s e c^{- 1}$

0 0

New answer posted

6 months ago

Physics Motion in a Plane

Two vectors $\vec{A} a n d \vec{B}$ have equal magnitudes. If magnitude of $\vec{A} + \vec{B}$ is equal to two times the magnitude of $\vec{A} - \vec{B},$ then the angle between $\vec{A} a n d \vec{B}$ will be:

0 Follower 3 Views

alok kumar singh

Contributor-Level 10

$| \vec{A} + \vec{B} | = 2 | \vec{A} - \vec{B} |$

Given A = B

Squaring equation (1) both side.

${| \vec{A} + \vec{B} |}^{2} = {(2 | \vec{A} - \vec{B} |)}^{2}$

$A^{2} + B^{2} + 2 \vec{A} . \vec{B} = 4 (A^{2} + B^{2} - 2 \vec{A} . \vec{B})$

2A² + 2A² cosq = 4 (2A² – 2A² cosq)

2A² + 2A² cosq = 8A² – 8A² cosq

10A² cosq = 6A²

cosq = $\frac{3}{5}$

q = cos^-1 (3/5)

0 0

New answer posted

6 months ago

Physics Thermal Properties of Matter

In van dar Wall equation $[P + \frac{a}{V^{2}}] [V - b] = R T; P$ is pressure, V is volume, R is universal gas constant and T is temperature. The ratio of constants $\frac{a}{b}$ is dimensionally equal to:

0 Follower 1 View

alok kumar singh

Contributor-Level 10

dimension of a Pv²

$\frac{a}{b} = p v$ dimension of b = v

0 0

New answer posted

6 months ago

Physics Laws of Motion

A block of metal weighing 2kg is resting on a frictionless plane (as shown in figure). It is struck by a jet relasing water at a rate of 1 kgs^-1 and at a speed of 10 ms^-1. Then, the initial acceleration of the block, in ms^-2, will be: