Answer questions on electromagnetic spectrum
Activity 1
Explain what is meant by electromagne...
Physics, 19.08.2021 14:00 grumpygirl0720
Answer questions on electromagnetic spectrum
Activity 1
Explain what is meant by electromagnetic spectrum.
2 Arrange ultraviolet radiation, radio waves, X-rays and visible light in
order of increasing frequency.
3. Arrange infrared radiation, gamma rays, microwaves and visible light in
order of increasing wavelength.
4
Calculate the:
41 frequency of an X-ray with a wavelength of 1 nm
42 wavelength of a radio wave with a frequency of 100 MHz.
5 Sunlight and welding arcs are sources of ultraviolet that can affect the
skin and eyes.
5.1 Why does ultraviolet radiation cause harm?
5.2 Suggest ways of protecting yourself against harmful radiation.
6 Why does the operator of an X-ray machine stand where she cannot
receive any radiation?
Answers: 3
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Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?
Answers: 1
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Acar moves at 12m/s and coasts up a hill with a uniform acceleration of -1.6m/s2. how far has it traveled after 6.0s?
Answers: 1
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Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.
Answers: 1
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