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Name the Scientist Who Discovered - Physics

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प्रश्न

Name the scientist who discovered Infra-red waves

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उत्तर

Hershell

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 2: Light - Exercise 2.3 ii [पृष्ठ ११०]

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फ्रैंक Physics - Part 2 [English] Class 10 ICSE
अध्याय 2 Light
Exercise 2.3 ii | Q 6.5 | पृष्ठ ११०

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The small ozone layer on top of the stratosphere is crucial for human survival. Why?


Name the waves of wavelength nearly 0.1 nm.


Consider a photon of a continuous X-ray coming from a Coolidge tube. Its energy comes from


What potential difference should be applied across an X-ray tube to get X-ray of wavelength not less than 0.10 nm? What is the maximum energy of a photon of this X-ray in joule?

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)


Give two properties of ultraviolet radiations which differ from the visible light.

What is the wavelength of the wave whose frequency is 1012 Hz? Name the electromagnetic wave.


Choose the correct option.

How does the frequency of a beam of ultraviolet light change when it travels from air into glass?


X-rays, gamma rays and microwaves travelling in a vacuum have ______.


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)


In an atom X, electrons absorb the energy from an external source. This energy “excites” the electrons from a lower-energy level to a higher-energy level around the nucleus of the atom. When electrons return to the ground state, they emit photons.

The figure below is the energy level diagram of atom X with three energy levels, E1 = 0.00eV, E2 = 1.78eV and E3 = 2.95eV. The ground state is considered 0 eV for reference. The transition of electrons takes place between levels E1 and E2.

  1. What wavelength of radiation is needed to excite the atom to energy level E2 from E1?
  2. Suppose the external source has a power of 100 W. What would be the rate of photon emission?

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