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if the speed of an observer v is added to the speed of light c, the resultant speed will be equal to :

(a) v+c

(b) v-c

(c) c

(d) v

If v speed of observer is added to c of light than resultant

A)v

B)v+c

C)c

D)v-c

At 88 meters high a rock is thrown horizontally from the top of a cliff, with a horizontal speed of 25 m/s. Now, what's the direction of velocity and with what velocity does the rock hit the ground?

In the electron positron pair production, the speed of electron is:

A)zero

B)less than the speed of positron

C)equals to speed of positron

D)greater than speed of positron

Use dimensional analysis to show the correct dimensions

for quantities below.

(8)

QUANTITY. DIMENSION

FORCE

POWER

PRESSURE

WORK, ENERGY

b. Prove that the equation F=ma is dimensionally correct

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

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