Revision Worksheet 4
Physics Class VII
1. _______ waves used for FM stereo radio.
2. Light is a member of a whole family of waves called the _______________________.
3. Hot things like fire and __________ give off _______________________.
4. UHF waves are used for ____________.
5. The speed of light through space is ________________.
6. The shorter the wavelength, the ____________ the frequency.
7. Some chemicals glow when they absorb ultraviolet rays. The effect is called ___________
8.Ionization is harmful to ____________________.
9._____________________ work by transmitting infrared pulses.
10. ______________________ is possible with infrared cameras.
11. _______________ are very short-wavelength radio waves.
12. Short-wavelengths are more ________________ than long-wavelength
Answers
Questions:
1. _______ waves used for FM stereo radio.
2. Light is a member of a whole family of waves called the _______________________.
3. Hot things like fire and __________ give off _______________________.
4. UHF waves are used for ____________.
5. The speed of light through space is ________________.
6. The shorter the wavelength, the ____________ the frequency.
7. Some chemicals glow when they absorb ultraviolet rays. The effect is called ___________
8.Ionization is harmful to ____________________.
9._____________________ work by transmitting infrared pulses.
10. ______________________ is possible with infrared cameras.
11. _______________ are very short-wavelength radio waves.
12. Short-wavelengths are more ________________ than long-wavelength
Answer:
1) VHF
2) electromagnetic spectrum
3) radiators, infrared
4) television
5) 300000km/s
6) higher
7) fluroscence
8) living cells
9) TV remote controllers
10) night photography
11) microwaves
12) penetrating
Answer:
1) VHF
2) electromagnetic spectrum
3) radiators, infrared
4) television
5) 300000km/s
6) higher
7) fluroscence
8) living cells
9) TV remote controllers
10) night photography
11) microwaves
12) penetrating