L6th Definitions 2

What is a random error in the context of measurement errors?

• Error caused by predictable factors

• Error caused by unpredictable factors varying from one measurement to another

• Error always occurring in the same magnitude

• Error that can be easily corrected

Define strong interaction

• It is the force that holds quarks together in a proton or neutron and acts between hadrons.

• It is the force responsible for radioactive decay.

• It is the interaction/force between two hadrons

• It is the gravitational force between masses.

Define threshold frequency

• The minimum frequency of light that can cause photoelectric emission

• The maximum frequency of light that can cause photoelectric emission

• The intensity of light required for photoelectric emission

• The energy required to remove an electron from the surface of a metal

Which type of wave is defined as a wave where the direction of vibration is perpendicular to the direction of energy propagation?

• Longitudinal wave

• Transverse wave

• Surface wave

• Electromagnetic wave

Which type of wave is defined as a wave where the direction of vibration is parallel to the direction of energy propagation.

• Surface wave
• Transverse wave
• Electromagnetic wave
• Longitudinal wave

A plane-polarised wave is

• A wave where vibrations occur in multiple planes

• A wave where vibrations are restricted to a single plane

• A wave that propagates in one direction only

• A wave that does not propagate

Define phase difference

• The measure of the displacement between two points or particles in periodic motion

• The ratio of the speed of two particles in motion

• The fraction of a cycle between the vibrations of two vibrating particles, expressed in radians or degrees

• The time difference between the peaks of two waves

Define path difference

• The difference in distances from two coherent sources to a point on an interference pattern

• The sum of distances from two coherent sources to a point on an interference pattern

• The product of distances from two coherent sources to a point on an interference pattern

• The ratio of distances from two coherent sources to a point on an interference pattern

Which of the following best describes Newton's 1st law?

• An object will continue to be in motion unless stopped by a force.

• An object remains at rest or in uniform motion unless acted on by a resultant force.

• For every action, there is an equal and opposite reaction.

• The force exerted by an object is equal to its mass times the acceleration.

Which statement defines Newton's 2nd law?

• F = ma represents the relationship between force and acceleration.

• The resultant force equals the mass times acceleration.

• Newton's 2nd law states that the resultant force is equal to the rate of change of momentum.

• Momentum is conserved in an isolated system.