Class 12th

Contributor-Level 10

De Broglie wavelength

$λ = \frac{h}{m V} = \frac{h}{\sqrt[]{2 m E}} E \to K . E .$

$E = \frac{3}{2}$ KT for gas

$S o λ = \frac{h}{\sqrt[]{3 m K T}} = \frac{6.6 * 1 0^{- 34}}{\sqrt[]{3 * 9 * 1 0^{- 31} * 1.38 * 1 0^{- 23} * 300}}$

$\begin{array}{l} λ = 6.26 * 1 0^{- 9} m \\ λ = 6.26 n m \end{array}$

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a year ago

Four jumbled up sentences, related to a topic, are given below. Three of them can be put together to form a coherent paragraph. Identify the odd one out.

1. The genesis of Dogecoin in December 2013 lies in the sarcastic approach of the founders, Jackson Palmer and Billy Markus to create a payment system based on a joke, making fun of the wild speculation in cryptocurrencies at the time. It all started with a tweet from Palmer, a software engineer of good standing in 2013.

2. Palmer was later joined by another innovator Billy Markus who was working with IBM.

3. They both founded Dogecoin. Whether it remains a sarcastic meme coin or not,

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Contributor-Level 10

The last sentence talks about edible stems while the first three sentences talk about importance of daylight for plants.

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New answer posted

a year ago

Four jumbled up sentences, related to a topic, are given below. Three of them can be put together to form a coherent paragraph. Identify the odd one out.

2. Palmer was later joined by another innovator Billy Markus who was working with IBM.

3. They both founded Dogecoin. Whether it remains a sarcastic meme coin or not,

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Class 12th Physics Magnetism and Matter

Contributor-Level 10

The last sentence talks about investment in cryptocurrencies while the first 3 sentences talk about Dogecoin.

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a year ago

Following plots show Magnetization (M) vs Magnetising field (H) and Magnetic susceptibility $(χ)$ vs temperature (T) graph:

Which of the following combination will be represented by a diamagnetic material?

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Contributor-Level 10

Magnetization (M) is directly proportional to magnetizing field and magnetic susceptibility does not depend on temperature so option 3 is correct.

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a year ago

Class 12th Physics

A capacitor is connected to a 20 V battery through a resistance of 10 $Ω .$ It is found that the potential difference across the capacitor rises to 2V in 1 $μ s .$ The capacitance of the capacitor is________ $μ F .$

Given $I n (\frac{10}{9}) = 0.105$

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Contributor-Level 10

V = 10 $(1 - e^{- t / R C})$

2 = 20 $(1 - e^{- t / R C})$

$\frac{1}{10} = 1 - e^{- t / R C}$

$e^{t / R C} = \frac{10}{9}$

$\frac{t}{R C} = l n (\frac{10}{9}) = 0.105$

$C = \frac{t}{R * 0.105} = \frac{1 0^{- 6}}{10 * 0.105} = 0.95 μ F$

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New answer posted

a year ago

Class 12th Physics

A glass tumbler having inner depth of 17.5cm is kept on a table. A student starts pouring water $(μ = 4 / 3)$ into it while looking at the surface of water from the above. When he feels that the tumbler is half filled, he stops pouring water. Up to what height, the tumbler is actually filled?

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Contributor-Level 10

As observer is at O So height of water observed by observer

$\Rightarrow \frac{H}{μ_{ω}} = \frac{H}{(4 / 3)} = \frac{3 H}{4}$

given diagram (17.5 - H) is height of observer

$S o \frac{3 H}{4} = 17.5 - H$

$\frac{7 H}{4} = 17.5$

7H = 70

H = 10

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a year ago

Class 12th Physics Nuclei

The half life period of radioactive element x is same as the mean life time of another radioactive element y. Initially they have the same number of atoms. Then:

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Contributor-Level 10

${(t_{\frac{1}{2}})}_{x} = {(t_{m e a n})}_{y}$
$\frac{l n 2}{λ_{x}} = \frac{1}{λ_{y}}$

$λ_{x} = (l n 2) λ_{y}$

Given N_x = N_y = N₀

So activity A = $λ N$

$A s λ_{x} < λ_{y} \Rightarrow A_{x} < A_{y}$

So y will decay faster than x.

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a year ago

The four sentences (labelled 1, 2, 3 and 4) below, when properly sequenced, would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and choose the correct option.

1. The remaining 50 per cent is allocated in mid- and small-cap stocks which helps in boosting the overall return.

2. Within equity, the fund prefers to invest 50 per cent in large-cap stocks, which provides stability in volatile times.

3. Considering the higher volatility in the market, the fund is following a conservative approach by tilting the equity portfolio towards large-cap stocks.

4. As on March 31, 2023, the fund has deploye

Class 12th Physics Moving Charges and Magnetism

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Raj Pandey

Contributor-Level 9

21 is a link here. As the 1^st sentence talks about the other 50% investment. No other option has this link.

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a year ago

There are two infinitely long straight current carrying conductors and they are held at right angle to each other so that their common ends meet at the origin as shown in the figure given below. The ratio of current in both conductor is 1 : 1. The magnetic field at point P is

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Contributor-Level 10

$B_{1} = \frac{μ_{0} l}{4 π y} [s i n θ_{1} + s i n 90 °] - - - - - - - (i)$

B due to OX wire

$B_{2} = \frac{μ_{0} l}{4 π x} [s i n θ_{2} + s i n 90 °]$

As in the diagram direction of B₁ and B₂ are in downward direction

So B = B₁ + B₂

$B = \frac{μ_{0} l}{4 π y} (s i n θ_{1} + 1) + \frac{μ_{0} l}{4 π x} (s i n θ_{2} + 1)$

$B = \frac{μ_{0} l}{4 π x y} [(x + y) + \sqrt[]{x^{2} + y^{2}}]$

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a year ago

1. PAs, though crucial, are not enough to conserve biodiversity.

2. One of the key targets of the first draft of the Global Biodiversity Framework published recently is to conserve at least 30% of global land and sea areas as protected areas (PAs).

3. This is especially so in the case of landscapes where PAs are not well connected, and buffer areas are largely multi-use.

4. The framework is aimed at advancing the goals of the United Na