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A rock is thrown horizontally from the top of a cliff 88 m high, with a horizontal speed

of 25 m/s.With what velocity does the rock hit?


Calculate the time for an atomic system for which that system can have the excitation energy for



the spectral line of width 10-4Å at wavelength 6000Å.

A rock is thrown horizontally from the top of a cliff 88 m high with a horizontal speed of 25 m/s, what is the direction of velocity?


1. Give the number of protons , neutrons, and electrons in 238/92 U

2. What is the radius of the nucleus of  24/14 Si? What is its volume?



A rock is thrown horizontally from the top of a cliff 88m high , with a horizontal speed of 24m/s with what velocity does the rock hit and what is the direction of velocity


a rock is thrown horizontally from the top of a cliff 88 m high, with a horizontal speed of 25 m/s. with what velocity does the rock hit?

Show that simple harmonic motion y(t) = C1 cos ωt + C2 sin ωt can be written as:


a. y(t) = A sin(ωt + ϕ0)


b. y(t) = A cos(ωt + ϕ1)


1.      The speed of the bullet (m = 50g) and the speed of an electron ( m = 9.1 * 10-28g) are measured to be the same, namely 300 m/s, with an uncertainty of 0.01%. With what fundamental accuracy could we have located the position of each, if the position is measured simultaneously with the speed in the same expt.?



1.      A small object of mass 1 mg is confined to move between two rigid walls separated by 2 cm. (a) Calculate the minimum speed of the object. (b) If the speed of the object is 4 cm/s, find the corresponding value of ‘n’.



  Calculate the uncertainty in wavelength of a light emitted when an atom undergoes transition from an excited state that lasts for 10-3 second.



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