Beats

a beating wave is produced when

• two travelling waves, travelling in the same direction and with the same frequency, superimpose.

• two travelling waves, travelling in the same direction and with the similar frequencies, superimpose

• two travelling waves, travelling in opposite directions and with the same frequency, superimpose.

• two travelling waves travelling in the same direction of the same frequency but of different amplitudes that superimpose

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

A beating wave can be described as

• a wave where all particles along the wave move with changing amplitudes over time and are all slightly out of phase with each other

• a wave where all particles along the wave move with the same amplitude but are all slightly out of phase with each other

• a wave where all particles in the wave move with different amplitudes but they are all in phase with each other

• a wave where all particles in the wave move with changing amplitudes over time but are all in phase with each other

Tags

NGSS.HS-PS4-1

When you are grown up, your heart will beat about,

• 70 times a minute

• 17 times a minute

• 30 times a minute

Tags

NGSS.HS-LS1-3

You can count your heartbeats by feeling your

• Nerves

• Pulse

• Breathing

The mouse has very high pulse rate of

• 50 beats per minute

• 500 beats per minute

• 150 beats per minute

• 250 beats per minute

Tags

NGSS.HS-LS1-3

Which factor makes your pulse rate change?

• Gender

• Physical activity

• Height

• Complexion

Sandy counted 25 beats of her pulse on her wrist in 20 seconds. What was her pulse rate in beats per minute?

• 25 beats

• 45 beats

• 75 beats

• 500 beats

What happens to push blood out of the heart?

• The heart muscle contracts to reduce the volume in the heart chambers.

• The heart muscle relaxes to reduce the volume in the heart chambers.

• The heart muscle contracts to increase the volume in the heart chambers.

• The heart muscle relaxes to increase the volume in the heart chambers.

Pulse is measured in...

• Beats per minute

• Degrees

• mmHg

• Breaths per minute

Pulse above 90 is known as..

• tachycardia

• bradycardia

• echocardia

• manycardia