Answer to Question #160203 in Physics for Smayya Ruganyira

Question

Draw a circuit diagram which consists of the following components:

2 batteries in parallel

An open switch

2 resistors in parallel

An ammeter measuring total current

A voltmeter measuring potential difference across one of the parallel resistors

List 5 properties of a virtual image created by reflection from a plane mirror.

What angle does the principal axis make with a plane mirror?

Is the principal axis a normal to the surface of the plane mirror?

Do the reflected rays that contribute to forming the image from a plane mirror obey the law of reflection?

If a candle is placed 50 cm in front of a plane mirror, how far behind the plane mirror will the image be? Draw a ray diagram to show how the image is formed

Explain why ambulances have the word ‘ambulance’ reversed on the front bonnet of the car?

If a stool 0.5 m high is placed 2 m in front of a plane mirror, how far behind the plane mirror will the image be and how high will the image be?

If Susan stands 3 m in front of a plane mirror, how far from Susan will her image be located?

A dental technician uses a small mirror that gives a magnification of 4.0 when it is held 0.60cm from a tooth. What is the radius of the curvature of the mirror?

An object 2 cm high is placed 4 cm from a convex mirror. If the focal length of the mirror is 4 cm, find the position and size of the image by means of a ray diagram. Is the image real or virtual? Calculate the magnification.

An object 1 cm high is placed 4 cm from a concave mirror. If the focal length of the mirror is 2 cm, find the position and size of the image by means of a ray diagram. Is the image real or virtual? Calculate the magnification.

A semi-conductor is formed by ……… bonds

a. Covalent

b. Electrovalent

c. Co-ordinate

d. None of the above

The most commonly used semi-conductor is......

a. Germanium

b. Silicon

c. Carbon

d. Sulphur

Differentiate semi-conductor,conductor and insulators on basis of band gap.

Is a hole a fundamental particle in an atom .

Define a hole in a semi-conductor .

Why silicon and germanium are the two widely used semi-conductor materials?

Explain how watches can be considered as an electronic device.

List at least 8 electronic devices that are used at school.

You are provided with three electric components namely: one ordinary Dione, one resistor,one dry cell and connecting wires. Use the symbols of these elements to draw a complete electric circuit such that the ordinary diode is forward biased.

Answer 1

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