Unit-6

Fill in the blank: The loudness of a sound is determined by the ________ of the wave, while the pitch is determined by the ________.

• Amplitude

• frequency

Which waveform represents a louder sound?

• Higher Amplitude

• Lower Amplitude

MCQ: Which of the following frequencies corresponds to a higher-pitched sound?

• 20 Hz

• 1,000 Hz

• 15,000 Hz

Fill in the blank: When two sound waves combine to create a louder sound, this is called ________. When they cancel each other out, this is called ________.

• Destructive and Constructive Interference

• Constructive and Destructive Interference

What type of interference is shown in the diagram?

• Constructive Interference

• Destructive Interference

• Neither a or b

Two sound waves have the same frequency and amplitude but are out of phase by 180°. What will happen when they meet?

• they become louder

• the amplitude increases

• cancels out

• adds together

MCQ: When sound waves reinforce each other, the resulting sound has:

• Higher pitch but the same loudness

• Lower pitch and lower loudness

• Greater loudness but the same pitch

MCQ: What was one major consequence of the asteroid collision that occurred approximately 65 million years ago?

• The formation of the Moon

• Mass extinction of dinosaurs

• The rise of nebulae

Fill in the blank: An asteroid collision with Earth can release massive amounts of ________ into the atmosphere, blocking sunlight and leading to ________.

• climate change, gas

• gas, dust

• gas, climate change

• dust, climate change

MCQ: According to the collision theory, the Moon was formed when:

• A small planet collided with Mars.

• A Mars-sized object collided with Earth.

• An asteroid hit the Sun.