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Can the potential barrier across a p-n junction be measured by simply connecting a voltmeter across the junction?
No, the potential barrier across a p-n junction cannot be measured directly using a voltmeter because the depletion region lacks free charge carriers. The voltmeter measures external voltage, but the built-in potential exists internally, preventing direct measurement without disturbing the junctionRead more
No, the potential barrier across a p-n junction cannot be measured directly using a voltmeter because the depletion region lacks free charge carriers. The voltmeter measures external voltage, but the built-in potential exists internally, preventing direct measurement without disturbing the junction equilibrium.
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If a train travelling at 72 km h⁻¹ is brought to rest by applying brakes in a distance of 200 m, then the retardation of the train is
(d) Here initial velocity of train u = 72km/h = 72 5/18 m s⁻¹, final velocity of train v = 0 and distance covered by train during this time s = 200 m ∴ v² - u² = 2as ∴ (0)² - (20)² = 2(a) × 200 or -400 = 400 a ⇒ a = - 1 m s⁻² Thus retardation of the train is 1 m s⁻². https://www.tiwariacademy.com/ncRead more
(d) Here initial velocity of train u = 72km/h = 72 5/18 m s⁻¹, final velocity of train v = 0 and distance covered by train during this time s = 200 m
∴ v² – u² = 2as
∴ (0)² – (20)² = 2(a) × 200 or -400 = 400 a ⇒ a = – 1 m s⁻²
Thus retardation of the train is 1 m s⁻².
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See lessThe velocity of sound in a gas depends on:
The velocity of sound (v) in a gas is determined by the formula: v = √(γRT/M) where: - γ is the adiabatic index, - R is the universal gas constant, - T is the absolute temperature, - M is the molar mass of the gas. Since v ∝ √T, the velocity of sound increases with temperature. Pressure does not dirRead more
The velocity of sound (v) in a gas is determined by the formula:
v = √(γRT/M)
where:
– γ is the adiabatic index,
– R is the universal gas constant,
– T is the absolute temperature,
– M is the molar mass of the gas.
Since v ∝ √T, the velocity of sound increases with temperature. Pressure does not directly affect the speed of sound in an ideal gas because both pressure and density change proportionally, keeping their ratio constant.
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The ratio of specific heats (Cₚ / Cᵥ) for a monoatomic gas is:
The ratio of specific heats (γ = Cₚ / Cᵥ) for a monoatomic gas is given by: γ = (f + 2) / f where f is the degrees of freedom. For a monoatomic gas, f = 3 (translational motion only), so γ = (3 + 2) / 3 = 5/3 ≈ 1.67 So, the ratio of specific heats for monoatomic gas is 1.67. Click here for more: httRead more
The ratio of specific heats (γ = Cₚ / Cᵥ) for a monoatomic gas is given by:
γ = (f + 2) / f
where f is the degrees of freedom. For a monoatomic gas, f = 3 (translational motion only), so
γ = (3 + 2) / 3 = 5/3 ≈ 1.67
So, the ratio of specific heats for monoatomic gas is 1.67.
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Why does River Brahmaputra carries less silt and water in Tibet?
The correct answer is: (b) Tibet is cold and dry Explanation: The Brahmaputra River originates in the Tibetan Plateau near Lake Mansarovar and flows through Tibet before entering India and Bangladesh. While in Tibet, the river carries less silt and water due to the following reasons: Cold and Dry ClRead more
The correct answer is: (b) Tibet is cold and dry
Explanation:
The Brahmaputra River originates in the Tibetan Plateau near Lake Mansarovar and flows through Tibet before entering India and Bangladesh. While in Tibet, the river carries less silt and water due to the following reasons:
Cold and Dry Climate – Tibet has a cold desert climate with low rainfall, meaning there is less erosion and less water flowing into the river.
Limited Tributaries – In Tibet, the Brahmaputra does not receive many tributaries, so it remains shallow and slow-moving.
Glacial Source – The river is mainly fed by melting glaciers, which provide a steady but low volume of water in Tibet.
This question related to Chapter 3 Social Science Class 9th NCERT. From the Chapter 3 Drainage. Give answer according to your understanding.
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