Mechanics
What is the unit of stress?
Nm-2 or Pa
Time for one complete wave.
Period
Charge of 1 electron.
1.6 x 10-19 C
An experiment that leads to discovery of nuclear atom.
Alpha scattering experiment
Atmospheric pressure at sea level has a value of 100 kPa. The density of sea water is 1020 kgm–3.
At what depth in the sea would the total pressure be 110 kPa?
1.0 m
Electromagnetic waves from an unknown source in space were found to be significantly diffracted when passing through gaps of the order of 10–5 m.
Which type of wave are they most likely to be?
Infra-Red
What quantity is conserved in Kirchhoff's first law?
Charge
Three quarks that have charge of 2/3 e.
up, top, charm
A car of mass 750 kg has a horizontal driving force of 2.0 kN acting on it. It has a forward horizontal acceleration of 2.0 ms–2.
What is the resistive force acting horizontally?
0.50 kN
Using monochromatic light, interference fringes are produced on a screen placed a distance D from a pair of slits of separation a. The separation of the fringes is x.
Both a and D are now doubled.
What is the new fringe separation?
The number of free electrons passing a point in a wire in 24 hours is 6.0 x 1023.
What is the average current in the wire?
1.1 A
Charge composition of neutron.
udd
Two characteristics of elastic collision.
1. Kinetic energy is conserved
2. Relative speed of approach equals relative speed of separation
In term of wavelength, the distance between two consecutive nodes is
The filament of a 240 V, 100 W electric lamp heats up from room temperature to its operating temperature. As it heats up, its resistance increases by a factor of 16.
What is the resistance of the filament at room temperature?
36 ohm
What quark change happens during electron decay?
down to up
A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank. Both the hammer and nail come to rest after the collision.
What is the approximate average force that acts on the nail while it moves through 5.0 mm?
2000 N
A parallel beam of light of wavelength 450 nm is incident normally on a diffraction grating which has 300 lines/mm.
What is the total number of intensity maxima observed?
15
Two copper wires of equal length are connected in parallel. A potential difference is applied across the ends of this parallel arrangement. Wire S has a diameter of 3.0 mm. Wire T has a diameter of 1.5 mm.
What is the value of the ratio of current in T and in S?
4
Particle emitted during positron decay.
(electron) neutrino