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a. A certain radioactive material emits gamma rays with energy 1 MeV. Another sample of radioactive material emits gamma rays with energy 10 keV. If both of these emit the same amount of energy per unit time, compare their activities.
b. A source of 198Au with a half-life of 2.69 days has an initial activity of 5 Ci. Calculate the activity after 4.0 days. Express this activity in Bq.
when p type and n type semiconductor are joined or connected it is called p-n junction...in p-n junction the holes from p-type diffuse to n-type and vice versa....an finally a depl
Explain power of a lens. What is the principle of an optical fibre? What is a thin prism? Describe angular dispersion between two colours for a prism.
write a note on pascal discovry in helping to make hydrolic jacks
Three capacitors of capacitance , and are connected in parallel 1) What is the ratio of potential difference? 2) What is the ratio of charges? Will there be electric
A coil of inductance 100 mH and resistance 800Ω is connected in parallel with a variable capacitor across a 12V, 5kHz supply. Determine for the condition when the supply curre
Study of a rolling ball A large ball bearing or 'bagatelle ball' rolling down a smooth track can be timed by a pendulum. To make the track, fasten together two 120 cm lengths o
which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon
A 0.040-kg bullet is fired into a 3.50-kg block of wood, which was initially at rest. The bullet remains embedded within the block of wood after the collision. The bullet
how heat energy is liberated during respiration?
Atwood's machine A weight-and-pulley system is used to measure the acceleration because of gravity at Earth's surface through measuring the net acceleration of a set of weight
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