Advertisements
Advertisements
प्रश्न
Choose the correct option related to wavelengths (λ) of different parts of the electromagnetic spectrum.
विकल्प
`λ_"x-rays" < λ_"micro waves" < λ_"radio waves" < λ_"visible"`
`λ_"visible" < λ_"X-rays" < λ_"radio waves" < λ_"micro waves"`
`λ_"radio waves" < λ_"micro waves" < λ_"visible" <λ_"X-rays"`
`λ_"visible" < λ_"micro waves" < λ_"radio waves" < λ_"X-rays"`
Advertisements
उत्तर
`λ_"radio waves" < λ_"micro waves" < λ_"visible" <λ_"X-rays"`
Explanation:
∵ E = `(hc)/lambda`
The orderly arrangement of different parts of EM wave in decreasing order of wavelength is as follows:
`λ_"radio waves" > λ_"microwaves" > λ_"IR" > λ_"visible" > λ_"UV" > λ_"X-rays" > λ_"gamma"`
APPEARS IN
संबंधित प्रश्न
Why are infra-red waves often called heat waves? Explain.
The wavelength of Kα X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell of a tungsten atom. What should be the minimum accelerating voltage across an X-ray tube having tungsten target which allows production of Kα X-ray?
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
The distance between the cathode (filament) and the target in an X-ray tube is 1.5 m. If the cutoff wavelength is 30 pm, find the electric field between the cathode and the target.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Suppose a monochromatic X-ray beam of wavelength 100 pm is sent through a Young's double slit and the interference pattern is observed on a photographic plate placed 40 cm away from the slit. What should be the separation between the slits so that the successive maxima on the screen are separated by a distance of 0.1 mm?
State two properties of infrared radiations which differ from visible light.
If the Earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
An e.m. wave exerts pressure on the surface on which it is incident. Justify.
A bat moving at 10 ms−1 towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f The value of f in Hz is close to (speed of sound = 320 ms−1)
Why does microwave oven heats up a food item containing water molecules most efficiently?
Name two electromagnetic waves of wavelength smaller than that of violet light.
