USUS UKUKIndiaIndia

Every Question Helps You Learn

Parents Students Tutors Teachers
Join Us
USUS UKUKIndiaIndia
Join Us
Elementary (Grade 1-2)Elementary (Grade 3-5)Middle (Grade 6-8)Junior High (Grade 9-10)Senior High (Grade 11-12)Spanish (All ages)ESL (All ages)GamesSpecialist (All ages)
  1. Home
  2. Senior High School: 11th and 12th Grade
  3. Physics: Senior High School: 11th and 12th Grade
  4. Physics - Infrared Radiation
Streak
Leading Streak Today
Your Streak Today
Streak
Leading Streak Today
Your Streak Today
Physics - Infrared Radiation
Infrared radiation is the main method of heat transfer in an electric toaster.

Physics - Infrared Radiation

This Physics quiz is called 'Physics - Infrared Radiation' and it has been written by teachers to help you if you are studying the subject at senior high school. Playing educational quizzes is one of the most efficienct ways to learn if you are in the 11th or 12th grade - aged 16 to 18.

It costs only $12.50 per month to play this quiz and over 3,500 others that help you with your school work. You can subscribe on the page at Join Us

Infrared radiation is a part of the electromagnetic spectrum. This is a spectrum of waves that also includes light. Infrared is also called thermal radiation and is one way in which heat is transferred. Infrared is emitted (given off), absorbed (taken in) and reflected by all objects. Hotter objects give out more infrared radiation than cooler ones. It has a wavelength of just a little longer than red light waves - you may have seen or done an experiment yourself using a thermometer, prism and light source. When the visible light is dispersed (split into the colors of the rainbow) by the prism, if you hold the thermometer just beyond where the red is, the reading will increase slightly.

1 .
Thermal radiation travels at what speed?
Very slowly
Instantaneously
The speed of sound
The speed of light
It is a member of the electromagnetic spectrum
2 .
Why are car radiators often painted matt black?
So that splashes of engine oil won't show up
To make them more efficient
To make the car more attractive to buyers
It is a legal requirement
The radiator is designed to reduce the temperature of the cooling water circulating round the engine. Painting it black increases the amount of infrared radiation it gives out, making it more efficient
3 .
Which of the following does not use infrared radiation?
Security lamps
A head torch
A remote control for a TV
An intruder alarm
Not all burglar alarms use infrared detectors but many do
4 .
Which one of the following emits the most infrared radiation?
1 kg of water at 95oC
1 kg of iron at 68oC
1 kg of your body at 37oC
1 kg of crude oil at 72oC
The hotter the object, the more infrared it emits
5 .
Put the following in order of best to worst reflectors of infrared radiation:

1. Red, dull
2. White, shiny
3. Black, dull
4. Red, shiny
1, 3, 4, 2
2, 4, 1, 3
1, 2, 3, 4
4, 1, 3, 2
Where the color is the same, shiny surfaces will reflect infrared better than dull ones. Dull surfaces scatter or absorb more of the incoming radiation
6 .
Which are the best emitters of thermal radiation?
Black, dull surfaces
Light colored dull surfaces
Black shiny surfaces
Light colored shiny surfaces
They are also the best absorbers of thermal radiation
7 .
The inside container of a thermos bottle is silvered. Why?
To reduce heat loss by radiation
To completely prevent heat loss by radiation
To reduce heat loss by evaporation
To reduce heat loss by condensation
Remember, all objects give off thermal radiation so no surface will completely prevent heat loss by thermal radiation, but silver shiny surfaces radiate the least of all and therefore reduce heat loss from the flask
8 .
In an electric toaster, what methods of heat transfer cook the bread?
Mainly radiation with some conduction
Mainly conduction and some radiation
Conduction and convection only
Mainly convection but conduction has a part to play too
Cooking is done using red hot wires. These give out a lot of thermal radiation. This heats the surface of the bread and the heat is conducted into the bread, cooking the inside of the slice. There is a gap between the heating wires and the bread so convection will play little or no part as the hot air rises out of the toaster in a convection current
9 .
Thermal radiation can only travel through which substances?
Solids
Liquids
Gases
Transparent and translucent substances
It can also travel through vacuums like space. It is very easily absorbed by opaque objects
10 .
In sunny countries, houses are often painted white. Why?
Painting them white lowers the U-value of the walls
White paint does not conduct heat
White is a good reflector of thermal radiation
The white paint reflects the light into the narrow streets which otherwise would be dark
Infrared radiation from the Sun heats up the outside of buildings. The heat then conducts through the walls and, if the sun shines on them all day, the inside of the buildings would become unbearably hot. Using white paint reflects the infrared radiation, keeping the walls cooler so less heat is conducted to the inside
Author:  Kev Woodward
Physics: Senior High School: 11th and 12th Grade Play this quiz again

Contact Details

Education Quizzes

Heron's Way, Wragg Marsh
Spalding
Lincolnshire
PE12 6HH
England

Email

admin@educationquizzes.com

Customer Service

Home Page Students Free Teacher Resources in the USA - 4,000 Teacher-Written Quizzes Tutors

Here To Help

Contact Us Quiz List and Sitemap FAQs

About Us

Our Team Testimonials Terms and Conditions Privacy Policy

© Copyright 2016-2024 - Education Quizzes
Work Innovate Ltd - Design | Development | Marketing

We use cookies to enhance your experience on our website.

To comply with the e-Privacy directive, we need your consent - I agree - No thanks - Learn more