Electromagnetic Waves Q & A

Q1: SPM2003/P1

click to enlarge

answer: C

Discussion:
in this kind of question u 've no choice..u need to memorize the spectrum.


Q2 : SPM2003/P1
At an airport, a passenger’s bag is placed in the baggage scanner.

The contents in the bag are examined by using:
A X-ray
B gamma rays
C ultraviolet rays
U infrared rays

ans: A

Recall back:
Electromagnetic waves

Sound Wave Q & A

Q1: SPM2004/P1

The diagram shows an ultrasonic waves
transmitted from a boat to the seabed to
determine the depth, D, of the sea. The
speed of the ultrasonic waves in water is
1 500 m s ‘.The echo of the waves is received
2.0 s after the transmission.

What is the value of D?

A 375m
B 750m
C 1500m
D 3000m

E 6000m

ans:C

Discussion:

The depth of sea water can be calculated using the formula : 2D = v x t
thus D= (1500 x 2)/ 2

Q2: SPM2003/P1
Ahmad shouts in front of a high wall. He hears the echo of his voice 1.2 seconds
later.The velocity of sound in air is 340 m/s.What is the distance between Ahmad and
the wall?
A 204m
B 283m
C 340m
U 408m
E 816m

ans:A

Discussion:
.. like in 2004 almost similar pattern of question came out in 2003. U can apply the same formula 2D = v x t ( D=distance, v=velocity, t=total time).

Q3: SPM2006/P1
Again..the same pattern came out in 2006

Diagram 21 shows a submarine transmitting ultrasonic waves directed at a big rock on the sea bed. After 10 seconds, the submarine detects the reflected wave.

Calculate the distance of the submarine from
the big rock.
[Velocity of ultrasonic wave =
1 560m/s]

A. 3.9 km
B. 7.8 km
C. 15.6 km
D. 31.2 km
E. 156.6 km

answer:

try this out first.. u can leave a comment to know the answer :).

SPM: Interference Q & A

Q1 : SPM 2003/P1

The diagram shows the fringe pattern produced from Young’s double slit experiment using the monochromatic red light source.
What happens to the fringes if monochromatic yellow light source is used?

A. The bright fringes are wider than the dark fringes
B. The dark fringes are wider than the bright fringes
C. The distance between consecutive fringes decrease
D. The distance between consecutive fringes increase

Ok to answer this one..u must remember the sequence of visible light (pelangi) spectrum.
it starts with red,orange,yellow,green,blue and so on.

from red to blue...the wavelength is decreasing,
So yellow wavellength is smaller,... by referring equation λ=(ax) /D ...

λ is directly proportional with x, thus x (distance between fringes)will also decrease.

Answer = C

Q2 : SPM 2004/P1

The diagram shows an interference pattern of two coherent water waves of sources, P and Q.
Which of the positions A, B, C or D, does destructive interference occur?

Answer: D

Q2 : SPM 2006/P1

Diagram 20 shows the interference patterns for water waves from two coherent source, S1 and S2.

Which of the following superposition of the waves at
shows the point Y?




answer= A (crest +trough = destructive interference)

Diffraction Q & A

Q1. SPM2003/P1
The diagram shows an arrangement of apparatus for light diffraction experiment.

Part C: Essay

Q2.
Figure 6.0 shows the arrangement of the apparatus for an experiment to study a
wave phenomenon.

Figure 6.1 shows the bright and dark bands of the waves pattern formed on the white paper when plane waves passes through the narrow and wide gaps.

(a) Name the wave phenomenon shown in figure 6.2. [1 mark]

(b) (i) Explain how the dark and light bands are formed on the white paper. [4 marks]

(ii) Observe Figure 6.2(a) and (b). Compare the waves patterns and the wavelength of

the waves before and after they pass through the gaps.

Relate the size of the gaps, the waves patterns and the wavelengths to deduce a

relevant physics concept. [5 marks]

....to know the answer email me fizbro@gmail.com

Recall back:
Diffraction Phenomena
Refraction Phenomena

SPM Q & A : Refraction

Exercise 1.3

1. Refraction of water wave of the sea water


1. Why are the speed and wavelength of waves in the middle of the sea almost uniform?

……………………………………………………………………………………………………………………………

2. What do you think would happen to the wave speed if the depth of water is increased?

……………………………………………………………………………………………………………………………

3. Why do the distances between the waterfronts decrease as the waves approach the beach?

……………………………………………………………………………………………………………………………

4. Why is the water in the bay stationary compared to the water at the cape?

……………………………………………………………………………………………………………………………

……………………………………………………………………………………………………………………………

(reference:JPNP)

to know the answer email me at fizbro@gmail.com