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

8 months ago

Physics Physics Wave Optics

The width of one of the two slits in a Young's double slit experiment is three times the other slit. If the amplitude of light coming from a slit is proportional to the slit-width, the ratio of minimum to maximum intensity in the interference pattern is x : 4 where x is_______.

0 Follower 6 Views

alok kumar singh

Contributor-Level 10

Amp. a slit with

Intensity a (Amp)² a (slit width)²

$\frac{l_{1}}{l_{2}} = {(\frac{3}{1})}^{2} = \frac{9}{1} \Rightarrow l_{1} = 9 I_{2}$

$\frac{l_{m i n}}{l_{m a x}} = \frac{{(\sqrt[]{l_{1}} - \sqrt[]{l_{2}})}^{2}}{{(\sqrt[]{l_{1}} + \sqrt[]{l_{2}})}^{2}} = \frac{{(3 - 1)}^{2}}{{(3 + 1)}^{2}}$

$\Rightarrow \frac{1}{4} = \frac{x}{4}$

x = 1.00

0 0

New answer posted

8 months ago

Physics Class 11th

What will be the power in case of a force acting perpendicular on a body?

0 Follower 2 Views

Aadit Singh Uppal

Contributor-Level 10

Formula for Power = F·v cos $θ$

According to the question, force is perpendicular.

So $θ$ = 90

and cos 90 = 0

Hence, the result turns out to be 0 i.e. no power generated inspite of force being applied.

0 0

New answer posted

8 months ago

Physics Class 11th

What is the exact difference between energy and power?

0 Follower 1 View

Aadit Singh Uppal

Contributor-Level 10

In simple words,

Energy = total work done on an object.

Power = how fast the work is done on an object.

For example: Writing an article vs how fast you write the article. This sums up the exact meaning of both these terms.

0 0

New answer posted

8 months ago

Physics Class 11th

Does a higher amount of power always means efficient energy usage?

0 Follower 1 View

Aadit Singh Uppal

Contributor-Level 10

No. Even if the power is higher, the energy can be inefficient. This happens when much of the energy generated gets wasted or isn't utilized as effectively as it should have been. In such cases, high power can still lead to inefficiency of energy.

0 0

New answer posted

8 months ago

Physics Physics Moving Charges and Magnetism

Metallic disc of inner radius and outer radius $2 R$ is rotating with an angular speed w . What will be the electric potential difference that appears between the inner and outer periphery. The mass of electrons is $m$ and charge is $e$ .

0 Follower 16 Views

Vishal Baghel

Contributor-Level 10

Answer (1)

$e E = e \frac{d V}{d r} = m ω^{2} r$

$? V = \int d V = \int_{R}^{2 R} \frac{m}{e} ω^{2} r d r$

$= ? V = \frac{3 m ω^{2} R^{2}}{2 e}$

0 0

New answer posted

8 months ago

Physics Class 12th

In the circuit shown below, maximum zener diode current will be _________mA.

0 Follower 3 Views

Payal Gupta

Contributor-Level 10

$l = \frac{120 - 60}{4000} = 0.015 A$

Thus l₂ = l - L_L

= 0.015 – 0.006

= 0.009 = 9mA

0 0

New answer posted

8 months ago

Physics Physics Atoms

In the hydrogen spectrum, $λ$ be the wavelength of first transition line of Lyman series. The wavelength difference will be $" a λ "$ between the wavelength of 3^rd transition line of Paschen series and that 2^ndtransition line B Balmer series where a = __________.

0 Follower 4 Views

Payal Gupta

Contributor-Level 10

For first line of Lyman

$\frac{1}{λ} = R (1 - \frac{1}{4}) = R \frac{3}{4}$

$λ = \frac{4}{3 R}$

3rd line (Paschen)

$\frac{1}{λ_{3}} = R (\frac{1}{3^{2}} - \frac{1}{6^{2}}) = \frac{R}{9} * \frac{3}{4}$

2nd line (B almer)

${\frac{1}{λ}}_{2} = R (\frac{1}{2^{2}} - \frac{1}{4^{2}}) = \frac{R}{4} * \frac{3}{4}$

$a (\frac{4}{3 R}) = \frac{20}{3 R} \Rightarrow a = 5$

0 0

New answer posted

8 months ago

Physics Physics Ray Optics and Optical Instruments

The graph between $\frac{1}{u} a n d \frac{1}{v}$ for a thin convex lens in order to determine its focal length is plotted as shown in the figure. The refractive index of lens is 1.5 and its both the surfaces have same radius of curvature R. The value of R will be _________cm. (where u = object distance, v = image distance)

0 Follower 15 Views

Payal Gupta

Contributor-Level 10

for point B, $\frac{1}{u} = - 0.10 c m^{- 1}, \frac{1}{v} = 0$

Thus u = 10 cm, v = $\infty$

i.e., f = 10 cm

$\frac{1}{10} = (1.5 - 1) (\frac{2}{R}) \Rightarrow \frac{1}{R} = \frac{1}{10}$

R = 10 cm

0 0

New answer posted

8 months ago

Physics Physics Alternating Current

The effective current I in the given circuit at very high frequencies will be _________A.

0 Follower 23 Views

Payal Gupta

Contributor-Level 10

At very high frequencies

$X_{C} = \frac{1}{ω C} \to 0$

$X_{L} = ω L \to \infty$

Thus equivalent circuit

$Z = 1 + 2 + 2 = 5 Ω$

$l = \frac{220}{5} = 44 A$

0 0

New answer posted

8 months ago

Physics Class 12th

Resistances are connected in a meter bridge circuit as shown in the figure. The balancing length $l_{2}$ is 40cm. Now as unknown resistance x is connected in series with P and new balancing length is found to be 80cm measured from the same end. Then the value of x will be _________ $Ω$ .

0 Follower 2 Views

Payal Gupta

Contributor-Level 10

Initially, $\frac{P}{Q} = \frac{40}{60} = \frac{2}{3}$ - (1)

Finally, $\frac{P + x}{Q} = \frac{80}{20} = \frac{4}{1}$

(2) (1)

$\frac{P + x}{P} = \frac{4 * 3}{2} = 6$

$\Rightarrow 1 + \frac{x}{P} = 6$

$\frac{x}{P} = 5$

x = 5 P = 5 * 4 = 20 $Ω$

0 0

Get authentic answers from experts, students and alumni that you won't find anywhere else

On Shiksha, get access to

66k Colleges
1.2k Exams
688k Reviews
1850k Answers

Community GuidelinesUser Points System

QuestionsDiscussionsTags

Need guidance on career and education? Ask our experts

Your Question

Physics

Questions

Discussions

Active Users

Followers

All

Discussions

Unanswered Questions

Share Your College Life Experience