The diagram above illustrates a variation of the displacement y of a wave particle with time t. lf the velocity of wave is 250ms-1, calculate the distance between two successive particles which are in phase
A20m
B2.5m
C3.0m
D5.0m
E50.0m
View Explanation & Discuss
Question 722
waec1996
The speed of sound in air is 330ms-1. How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash? (Neglect the time taken by light to travel to the observer)
A1320m
B165m
C600m
D330m
E343m
View Explanation & Discuss
Question 723
waec1996
A sound wave of velocity 350 ms-1 is directed towards the surface of water. lf the ratio of the wavelength of sound in water to that in air is 425:100, calculate the velocity on the wave in water
A82.4ms-1
B148.8ms-1
C350.0ms-1
D1487.5ms-1
E3500.5ms-1.
View Explanation & Discuss
Question 724
waec1996
The distance between two successive crests of a water is 1m. lf a particle on the surface of the water makes two complete vertical oscillations in 1 second, calculate the speed of the wave
A0.5 ms-1
B1.0 ms-1
C2.0ms-1
D3.0ms-1
E4.0ms-1
View Explanation & Discuss
Question 725
waec1996
A string of length 1.0 m vibrates in 10 loops. If the total mass of the string is 1.0 x 10-3 kg and the tension in it is 10N, calculate the frequency of the vibration.
A50Hz
B100Hz
C250Hz
D400Hz
E500Hz
View Explanation & Discuss
Question 726
waec1996
The walls and ceilings of many standard auditoria are covered with perforated pads to
Aincrease the intensity of sound waves
Bincrease the loudness of sound waves
Creduce the effect of reverberations of sound waves
Dincrease the interference effect of sound waves
Edecrease the frequency of sound waves.
View Explanation & Discuss
Question 727
waec1996
Which of the following instruments produces sound by the vibration of air column?
APiano
BGuitar
CFlute
DHand bell
ETalking drum
View Explanation & Discuss
Question 728
waec1996
A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object?
A2.0cm
B3.3cm
C5.0cm
D10.0cm
E15.0cm
View Explanation & Discuss
Question 729
waec1996
The refractive index of a medium relative to air is 1.8. Calculate the critical angle for the medium to the nearest degree.
A18o
B34o
C45o
D68o
E90o.
View Explanation & Discuss
Question 730
waec1996
When a ray of light is incident normally on an air- glass interface, its angle of refraction is
A0o
B42o
C45o
D60o
E90o
View Explanation & Discuss
Question 731
waec1996
A ray of light is incident on a glass block as shown in the diagram above. If the reflected and the retracted rays are perpendicular to each other, what is the refractive index of the glass relative to air.?
A1.60
B1.58
C1.52
D1.50
E1.48
View Explanation & Discuss
Question 732
waec1996
When a ray of light is incident normally on an air- glass interface, its angle of refraction is
A0o
B42o
C45o
D60o
E90o.
View Explanation & Discuss
Question 733
waec1996
The graph above shows the relationship between sin i and sin r for a ray of light in air incident on a liquid surface. If i and r are respectively angles of incidence and refraction, deduce the refractive index of the liquid from the graph
A1.63
B1.50
C1.33
D1.25
E0.08
View Explanation & Discuss
Question 734
waec1996
A boy walks away from a plane mirror at a speed of 3 ms-1 in a direction normal to the surface of the mirror. At what speed is his image approaching him?
A8 9.0ms-1
B6.0ms-1
C4.5ms-1
D1.5ms-1
E0.0ms-1
View Explanation & Discuss
Question 735
waec1996
A ray of light strikes a plane mirror at a glancing angle of 50o. Calculate the angle between the incident and reflected rays
A20o
B40o
C50o
D80o
E100o.
View Explanation & Discuss
Question 736
waec1996
In which of the following media would sound waves travel fastest?
AKerosine
BAlcohol
CWater
Dlron
EAir
View Explanation & Discuss
Question 737
waec1996
The main reason why rice cooks faster in a pressure cooker than in cooking pot is that
Aless heat escapes from the cooker
Bthe vapour pressure in the cooker is constant
Cthe rice is not affected by the draught over the cooker
Dthe vapour pressure in the cooker decreases
Ethe boiling point of water in the cooker is raised.
View Explanation & Discuss
Question 738
waec1996
Water boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of the mountain the
Asaturation vapour pressure of water is higher than at sea-level
Bsun adds more heat to the water
Ctemperature is lower than at sea- level
Drelative humidity of the atmosphere is lower
Epressure of the atmosphere is lower
View Explanation & Discuss
Question 739
waec1996
Cloud formation is the direct result of
Aprecipitation
Bvaporization
Cfusion
Dsublimation
Econdensation
View Explanation & Discuss
Question 740
waec1996
The saturated vapour pressure of a liquid increases as the
