# Physics Revision : Waves

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| By Mrguienghong
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Mrguienghong
Community Contributor
Quizzes Created: 2 | Total Attempts: 3,206
Questions: 7 | Attempts: 3,035  Settings  For sec 3/4/5 Physics students revision by mr gui eng hong Singapore

• 1.

### What is a Transverse wave ?

• A.

Wave that has particles vibrating up and down

• B.

Wave that has particles vibrating left and right

• C.

Wave that has particles that vibrate perpendicular to wave direction

• D.

Wave that has particles that vibrate parallel to wave direction

C. Wave that has particles that vibrate perpendicular to wave direction
Explanation
Transverse wave has particles vibrating perpendicular to wave. Longitudinal wave has particles vibrating parallel to wave.

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• 2.

### Which wave is a Longitudinal wave?

• A.

Sound wave

• B.

Light wave

• C.

Infra-Red wave

• D.

X-ray

A. Sound wave
Explanation
sound is the ONLY example of Longitudinal wave. the others are transverse waves

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• 3.

### A wave makes 10 oscillations in 5s. What is its frequency?

• A.

0.5 s

• B.

0.5 Hz

• C.

2 s

• D.

2 Hz

D. 2 Hz
Explanation
frequency is the number of oscillations made per second. 2 Hz means 2 oscillations made per second.

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• 4.

### A 100 Hz wave has wavelength 2.0 m. What is its speed?

• A.

0.02 m/s

• B.

2 m/s

• C.

50 m/s

• D.

200 m/s

D. 200 m/s
Explanation
speed = frequency x wavelength

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• 5.

### A light wave travels from air into plastic. which is true?

• A.

Frequency reduces

• B.

Only speed reduces

• C.

Frequency , speed and wavelength reduces

• D.

Speed and wavelength reduces

D. Speed and wavelength reduces
Explanation
frequency of wave depends on the source. when light slows down, frequency remains unchanged. since speed = frequency x wavelength, when speed decreases, wavelength also decreases

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• 6.

### The speed of light in vacuum is . . .

• A.

3 x 10^8 m/s

• B.

308 m/s

• C.

300 m/s

• D.

3 x 108 m/s

A. 3 x 10^8 m/s
Explanation
all elctromagnetic wave travels at 300 000 000 m/s in vacuum

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• 7.

### V : speed. F: frequency L: wavelength T:period. which equation is correct?

• A.

V=L/T

• B.

V=LT

• C.

V=F/T

• D.

V=FT

A. V=L/T
Explanation
F=1/T. V=FL = (1/T)L = L/T. Combine 2 equeations.

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