Echoes (waves) Flashcards

1
Q

When does an echo occur

A

An echo occurs whenever a sound wave is reflected off a hard surface

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2
Q

What is the equation for echos

A

Speed = Distance / Time

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3
Q

What is Radar

A

Radar is an object-detection system that uses radio waves to determine the range, altitude, direction or speed of objects

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4
Q

What is ultrasound

A

Ultrasounds are sounds that have a frequency above the range of human hearing These are called ultrasonic sounds

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5
Q

What are the uses of ultrasound

A

Medicine to scan to see unborn babies, Can break up kidney stones.
Industrial cleaning.
Sonar: Ships using echo-sounding.

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6
Q

What are the seven types of waves in the electromagnetic spectrum from Largest frequency to Smalles

A
Radio waves
Micro waves
Infrared light 
Visible light
Ultra violet 
X-ray 
Gamma ray
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7
Q

What properties do they all have in common

A

All can travel through a vacuum.

All travel through a vacuum at the same speed

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8
Q

What wave has the lowest frequency

A

Radio wave

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9
Q

What wave has the highest frequency

A

Gamma ray

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10
Q

Dangers and uses of radio waves

A

Dangers- none

Uses- wifi, communications

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11
Q

Dangers and uses of micro waves

A

dangers- none

uses- to heat food, satellite

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12
Q

Dangers and uses of Infrared

A

Dangers- Burns

Uses- toasters, remote controls

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13
Q

Dangers and uses of visible light

A

Dangers- blindness

Uses- seeing, photography

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14
Q

Dangers and uses of Ultraviolet

A

Dangers- skin cancer

Uses- Detecting bank note forgery, sun beds

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15
Q

Dangers and uses of X-ray

A

Dangers- cancer

Uses- detecting broken bones, luggage scanners

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16
Q

Dangers and uses of Gamma rays

A

Dangers: Cancer

Uses- Cure cancer, medical imagery