Reference no: EM13954396
1. (a) A circular conducting loop carries a current of 5.0 A and has radius 30 mm
(i) Calculate the magnetic field at the centre of the loop (H) How many turns would be needed to give a field of 1.0 mT
(b) A electron is injected into the 1.0 mT magnetic field mentioned in part (a) with a velocity of 2500 m S-lin a direction perpendicular to the field.
(i)What is the force on the electron?
(H)Describe the nature and magnitude of the path of the electron due to the influence of the magnetic field
2. The diagram above shows the end of a fiber optic cable with core refractive index 1.486 and cladding refractive index 1.472
(a) calculate the critical angle at which light in the core is just totally internally reflected at X
(b) calculate the angle of incidence at A for light which is just internally reflected in the cable
(c) calculate the speed of light in the core.
(d) calculate the time taken for light to travel 1.0 km directly down the center of the core
(e) calculate the longest time taken for light to traverse 1.0 km of cable by internal reflection
(t) estimate the maximum frequency of a signal which can be transmitted down 1.0 km of this optical fiber
3. (a) Kr-85 is a radioactive isotope that is used in measuring paper thickness. It decays by If emission with a half-life of 10.8 years
(i) write down the decay equation showing the daughter isotope and decay products of this process (H)a Kr-85 source had activity 30 mCi when new. Estimate its activity after 5 years' use
(iii) what is the activity of a 30 mCi source in becquerels?
(iv) what is the mass of Kr-85 in the source when new?
What is the amount left after 800 years
: Radioactice substances decay exponentially. The amount of radium present at an time t obeys the law Q(t)= Qoe^-kt, where Qo. is the initial amount present and k is a suitable positive constant. What is the amount left after 800 years?
|
Sets delimitations and establishes the boundaries of study
: sets the delimitations and establishes the boundaries of the study. states what the study will not cover or will not do. identifies the weaknesses and constraints which may affect the results of the study.
|
Describe the relationship between strength and time in words
: A hospital physicist measure the strength of a cobalt - 60 X-Ray machine every year. His result over a six year period are shown in the table. Strength is measured in MBq (megabecquerels) or millions of counts per second. Describe the relationship..
|
Simple and compound interest
: You invest $1,000 for five years at 5% simple interest at Bank 1. You invest $1,000 for five years at Bank 2 where interest at 5% is compounded annually. Compute the amounts that will be accumulated.
|
Calculate the speed of light in the core
: A circular conducting loop carries a current of 5.0 A and has radius 30 mm, Calculate the magnetic field at the centre of the loop (H) How many turns would be needed to give a field of 1.0 mT
|
Problem regarding the contingent liabilities
: Omega Company is involved in two unrelated lawsuits, one as the plaintiff and one as the defendant. As a result of these two lawsuits, the company has a contingent asset and a contingent liabil- ity. How should Omega record these on its balance sh..
|
Prepare an action plan to improve company image
: Put together an action plan that will help improve its corporate social responsibility efforts and pay more attention to environmental ethics.
|
Find the following probabilities.
: Consider the following joint frequency table which summarizes voting trends in the most recent Presidential election.
|
Flow chart of converting for hex
: Flow chart of converting for Hex
|