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1. Focal length fixed for a camera while it is variable for human eye.
chrispohmomanyi answered the question on February 9, 2018 at 10:42
- The SI unit of capacitance is the Farad. Define the Farad.(Solved)
The SI unit of capacitance is the Farad. Define the Farad.
Date posted: February 9, 2018. Answers (1)
- In domestic wiring (consumers fuse box) use of circuit breakers are preferred to fuses. Give two advantages of using a circuit breaker over a fuse.
(Solved)
In domestic wiring (consumers fuse box) use of circuit breakers are preferred to fuses. Give two advantages of using a circuit breaker over a fuse.
Date posted: February 9, 2018. Answers (1)
- What property of cathode rays is demonstrated by the maltese cross? (Solved)
What property of cathode rays is demonstrated by the maltese cross?
Date posted: February 9, 2018. Answers (1)
- State two operational differences between the C.R.O and the T.V tube.(Solved)
State two operational differences between the C.R.O and the T.V tube.
Date posted: February 9, 2018. Answers (1)
- State any two maintenance practices for secondary cells(Solved)
State any two maintenance practices for secondary cells
Date posted: February 9, 2018. Answers (1)
- How does intensity of radiation incident on a metal surface affect the photoelectrons emitted. (Solved)
How does intensity of radiation incident on a metal surface affect the photoelectrons emitted.
Date posted: February 9, 2018. Answers (1)
- What is meant by threshold wavelength? ...(Solved)
What is meant by threshold wavelength?
Date posted: February 9, 2018. Answers (1)
- State two ways of increasing the capacitance of a capacitor. (Solved)
State two ways of increasing the capacitance of a capacitor.
Date posted: February 9, 2018. Answers (1)
- State and explain the applications of capacitors(Solved)
State and explain the applications of capacitors.
Date posted: February 9, 2018. Answers (1)
- When Moses rubbed a glass rod on a duster and then held it near a few pieces of paper, it did not move them or...(Solved)
When Moses rubbed a glass rod on a duster and then held it near a few pieces of paper, it did not move them or pick them up. He concluded that there was no transfer of electric charge between the duster and the brass rod. He was wrong. Give a reason why he was wrong
Date posted: February 9, 2018. Answers (1)
- State the applications of total internal reflection(Solved)
State the applications of total internal reflection.
Date posted: February 9, 2018. Answers (1)
- State three properties of cathode rays(Solved)
State three properties of cathode rays
Date posted: February 9, 2018. Answers (1)
- State why mains electricity for long distances is transmitted at high voltages. (Solved)
State why mains electricity for long distances is transmitted at high voltages.
Date posted: February 9, 2018. Answers (1)
- Light passes through an opening of width 2 cm. Explain why light is not diffracted in the same way as sound at a similar size...(Solved)
Light passes through an opening of width 2 cm. Explain why light is not diffracted in the same way as sound at a similar size opening.
Date posted: February 9, 2018. Answers (1)
- Why is a burn from steam of boiling water more severe than that of boiling water itself?(Solved)
Why is a burn from steam of boiling water more severe than that of boiling water itself?
Date posted: February 9, 2018. Answers (1)
- A bullet is fired horizontally at a target. Neglecting air resistance, give a reason why the horizontal acceleration of the bullet is zero.(Solved)
A bullet is fired horizontally at a target. Neglecting air resistance, give a reason why the horizontal acceleration of the bullet is zero.
Date posted: February 9, 2018. Answers (1)
- If the mirror is rotated through an angle of 10 degrees, by how many degrees will the reflected ray be rotated?(Solved)
If the mirror is rotated through an angle of 10 degrees, by how many degrees will the reflected ray be rotated?
Date posted: February 9, 2018. Answers (1)
- A search boat uses a signal of frequency 6.0 x 104 Hz to detect a sunken
ship directly below. Two reflected signals are received; one...(Solved)
A search boat uses a signal of frequency 6.0 x 104 Hz to detect a sunken
ship directly below. Two reflected signals are received; one after 0.1
seconds from sunken boat and the other after 0.14 seconds from the sea
bed. If the sea bed is 98 m below the boat, determine:-
(i)The speed of the signal in water.
(ii)The depth of the sunken ship below the boat
Date posted: February 7, 2018. Answers (1)
- The half-life of an element X is 3.83 days. A sample of this element is
found to have an activity rate of 1.6 x 103...(Solved)
The half-life of an element X is 3.83 days. A sample of this element is
found to have an activity rate of 1.6 x 103 disintegrations per second at a
particular time. Determine its activity rate after 19.15 days
Date posted: February 7, 2018. Answers (1)
- A gas occupies a volume of 4000 litres at a temperature of 37 degrees celcius and normal atmospheric pressure. Determine the new volume of the gas...(Solved)
A gas occupies a volume of 4000 litres at a temperature of 37 degrees celcius and
normal atmospheric pressure. Determine the new volume of the gas if it is
heated at constant pressure to a temperature of 670C (normal atmospheric
pressure P= 1.01 x 105 pa)
Date posted: February 7, 2018. Answers (1)