Superposition of pulses

Calculate the amplitude of the resulting superimposed pulse ?

• -30 cm

• 10cm

• -20cm

• -10cm

Answer explanation

Take the upward direction as positive and the downward direction as negative

As it is destructive interference, subtract the two amplitudes

20 - 10 = 10

As the larger number (20 )is going downwards our answer will be negative .-10 cm

Calculate the resultant pulse ?

• • +4 cm

• +2cm

• -4cm

• -1cm

Calculate the amplitude of the pulse after they combine ?

• -35 m

• +175m

• +35m

• -70m

Answer explanation

Take upwards as positive and downwards as negative

Destructive interference so SUBTRACT the two amplitudes.

105m -70 m = 35 m

As the bigger pulse is moving upwards the answer will be positive 35 m.

Calculate the resultant pulse ?

• -30cm

• +30cm

• 20cm

• -10cm

Answer explanation

Take upwards as positive and downwards as negative

constructive interference so add the amplitudes

pulse is moving downwards so answer is negative.

What would the combined pulse look like ?

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What is the resultant pulse after they meet ?

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