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Complete the following diagram of a transformer and name the parts labeled A and B. Name the part you have drawn to complete the diagram . What is the material of this part? In this transformer a step-up or step-down? Why?
Concept: undefined >> undefined
Show that the quantity 2K/v2 has the unit of mass, where K is the kinetic energy of the body.
Concept: undefined >> undefined
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Two bodies A and B of masses m and M (M ≫ m) have same kinetic energy. Which body will have more momentum?
Concept: undefined >> undefined
A pebble is thrown up. It goes to a height and then comes back on the ground. State the different changes in form of energy during its motion.
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Name the form of energy in which potential energy can change.
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A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The total energy possessed by the body at any instant? (Take g = 10 ms-2).
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Calculate the decrease in the kinetic energy of a moving body if its velocity reduces to half of the initial velocity.
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A ball of mass 0.5 kg slows down from a speed of 5m/s-1 to that of 3m/s-1. Calculate the change in kinetic energy of the ball.
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A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What the kinetic energy of the ball just before it hits the ground ?
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A cell of e.m.f. 2 V and internal resistance 1.2 Ω is connected to an ammeter of resistance 0.8 Ω and two resistors of 4.5 Ω and 9 Ω as shown in following figure.
Find:
- The reading of the ammeter,
- The potential difference across the terminals of the cells, and
- The potential difference across the 4.5 Ω resistor.
Concept: undefined >> undefined
A certain radioactive nucleus emits a particle that leaves its mass unchanged, but increased its atomic number by one. Identify the particle and write its symbol.
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What changes occurs in the nucleus of radioactive elements when it emits (a) an alpha particle (b) beta particle and (c) gamma radiations? Give one example in each case in support of your answer.
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A nucleus is \[\ce {^24_11 Na}\] is β-radioactive.
What are the numbers 24 and 11 called?
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A nucleus of stable phosphorus has 15 protons and 16 neutrons.
- What is its atomic number and mass number?
- The nucleus of radio phosphorous has one neutron more than the stable nucleus. What will be its atomic number and mass number?
- What will be the atomic number and mass number of new nucleus formed by decay of a β-particle by the radio phosphorus in part (b)?
Concept: undefined >> undefined
A nucleus \[\ce {^A_Z X}\] emits 2 α particles and 1 β particles to form a nucleus \[\ce {^222_85 R}\]. Find the atomic nucleus and mass number of X.
Concept: undefined >> undefined
Complete the following nuclear change:
\[\ce {^a_x P -> Q + ^0_-1β}\]
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Complete the following nuclear change:
\[\ce{^238_92U -> ^234_90Th}\] + ______ + energy
Concept: undefined >> undefined
Complete the following nuclear change:
\[\ce {^238_92 P \text ->[α] Q \text ->[β] R \text ->[β] S}\]
Concept: undefined >> undefined
Complete the following nuclear change:
\[\ce {^A_Z X \text ->[α] X_1 \text ->[γ] X_2 \text ->[2β] X_3}\]
Concept: undefined >> undefined
Complete the following nuclear changes:
\[\ce {X \text ->[β] X_1 \text ->[α] X_2 \text ->[α] ^172_69 X_3}\]
Concept: undefined >> undefined
