Which of the following particles conduct electricity through salty water?

• A. Atom
• B. molecules
• C. Electrons
• D. Ions

(a) Distinguish between temperature and heat. State the units in which they are measured

(ii) State two physical properties used for measuring temperature.

(b) (i) Describe, with the aid of a diagram, how the upper fixed point is determined for a mecury-in-glass thermometer. State one precaution to ensure accurate results

(ii) State one advantage which a constant-volume gas thermometer has over other thermometers and one reason why it is seldom used as an everyday laboratory instrument.

(c) Using the kinetic theory of matter explain why evaporation causes cooling.

(a) Define dffraction.

(b)(i) Explain critical angle. The diagram here illustrates a ray of light passing through a rectangular transparent plastic block \(\alpha\) Determine the value of the critical angle. \(\beta\) Calculate the refractive index of the block.

(c) A pipe closed at one end has fundamental frequency of 200Hz. The frequency of the first overtone of the closed pipe is equal to the frequency of the first overtone of an open pipe. Calculate the:

(i) fundamental frequency of the open pipe;

(ii) length of the closed pipe;

(iii) length of the open pipe. [Speed of sound in air = 330 ms\(^{-1}\)]

(a) Define diffraction.

(b)(i) Explain critical angle. The diagram here illustrates a ray of light passing through a rectangular transparent plastic block \(\alpha\) Determine the value of the critical angle. \(\beta\) Calculate the refractive index of the block.

(c) A pipe closed at one end has fundamental frequency of 200Hz. The frequency of the first overtone of the closed pipe is equal to the frequency of the first overtone of an open pipe. Calculate the:

(i) fundamental frequency of the open pipe;

(ii) length of the closed pipe;

(iii) length of the open pipe. [Speed of sound in air = 330 ms\(^{-1}\)]

A student measures the volume of a liquid using a measuring cylinder. What else needs to be measured by the student in order to determine the density of the liquid?

• A. depth of the liquid in the cylinder
• B. mass of the cylinder
• C. mass of the liquid
• D. tempersture of the liquid

The force on a current carrying conductor in a magnetic field is greatest when the

• A. conductor makes an angle of 60° with the field
• B. force is idependent of the angles between the fields and the conductor
• C. conductor is parallel with the field
• D. conductor is at right angle with the field

Two capacitors R1 = 4Ω and R2 = 5Ω are connected in parallel across a potential difference. If P1 and P2 represent power dissipated in R 1 and R2 respectively, then the ratio P1 : P2 is

• A. 4 : 5
• B. 5 : 4
• C. 16 : 25
• D. 25 : 16

A mercury-in-glass thermometer read 4cm at ice point and 29cm at steam point. Calculate the temperature when the mercury level is at 9cm

• A. 13^oC
• B. 20^oC
• C. 33^oC
• D. 38^oC

(a) Write Einstein's photoelectric equation and identh: each component of the equation.

(b) For a photocell, star; one factor each that is responsible fo: the:

(i) emission (ii) rate of emission;

(iii) energy of photoelectrons.

(c)(i) Two nuclear equations are given below:

\(^{222}_{p}RN\) \(\to\) \(^{218}_{84}PO + ^q_2He\)...................A

\(^{214}_{83}RN\) \(\to\) \(^{214}_{84}PO + ^m_nX\)...................B

Determine the values of: (\(\alpha\)) p and q in equation A; (\(\beta\)) in and n in equation B and identify X.

(ii) Give a reason why it is important to dispose o radioactive waste safely.

(d)(i) A certain atom emits ultra violet photon of wavelength 2.4 x10\(^{-7}\)m. Calculate the energy of the photon:

----------------- - 6.0 x 10\(^{-19}\)J

---------------- - 8.2 x 10\(^{-19}\)J

---------------- - 8.8 x 10\(^{-19}\)J

---------------- - 16.7 x 10\(^{-19}\)J

(ii) The figure above illustrates the energy levels o the atom. Copy the figure in your answer booklet anc indicate on it, the energy level transitions which cause the emission of the photon in (d)(i) above. [h= 6.6 x 10\(^{-34}\) Js; c = 3.0 x 108 ms\(^{-1}\)].

A transverse pulse of frequency 9 Hz traves 4.5m in 0.6 s. Calculate the wavelength of the pulse.

• A. 3.33 m
• B. 0.30 m
• C. 0.83 m
• D. 1.20 m

Which of the following instruments produces sound by the vibration of air column?

• A. Piano
• B. Guitar
• C. Flute
• D. Hand bell