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Bad White [126]
2 years ago
8

Choose the correct description of what do we mean when we say that light is an electromagnetic wave and the relationship among w

avelength, frequency, and speed for light waves. choose the correct description of what do we mean when we say that light is an electromagnetic wave and the relationship among wavelength, frequency, and speed for light waves. we say that light is an electromagnetic wave because light is a oscillation of electric and magnetic fields. frequency=speedoflightwavelength we say that light is an electromagnetic wave because light is a motion of electric and magnetic fields. frequency=speedoflightwavelength we say that light is an electromagnetic wave because light is a oscillation of electric and magnetic fields. frequency=wavelengthspeedoflight we say that light is an electromagnetic wave because light is a motion of electric and magnetic fields. frequency=wavelengthspeedoflight
Physics
1 answer:
lakkis [162]2 years ago
4 0
An electromagnetic wave is the oscillation of electric and magnetic fields that propagate in the space. Electromagnetic waves carry energy and they do not need a medium to propagate (they can travel in vacuum as well).
The correct relationship between the speed of the wave (speed of light, c), the frequency f and the wavelength \lambda is
f=  \frac{c}{ \lambda}
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In a double-slit experiment, if the central diffraction peak contains 13 interference fringes, how many fringes are contained wi
Ronch [10]

Answer:

Explanation:

Width of central diffraction peak is given by the following expression

Width of central diffraction peak= 2 λ D/ d₁

where d₁ is width of slit and D is screen distance and λ is wave length.

Width of other fringes become half , that is each of  secondary diffraction fringe is equal to

λ D/ d₁

Width of central interference  peak is given by the following expression

Width of  each of  bright fringe =  λ D/ d₂

where d₂ is width of slit and D is screen distance and λ is wave length.

Now given that the central diffraction peak contains 13 interference fringes

so ( 2 λ D/ d₁)  /  λ  D/ d₂ = 13

then (  λ D/ d₁)  /  λ  D/ d₂ = 13 / 2

= 6.5

no of fringes  contained within each secondary diffraction peak = 6.5

6 0
3 years ago
A hot iron horseshoe (mass = 0.35 kg ), just forged, is dropped into 1.40 L of water in a 0.45 kg iron pot initially at 22.0°C.
olga_2 [115]

Answer:

420 °C

Explanation:

m_{h} = mass of the horseshoe = 0.35 kg

m_{w} = mass of the water = 1.40 L = 1.40 kg

m_{i} = mass of the iron pot = 0.45 kg

c_{i} = specific heat of iron = 450 J kg⁻¹ °C⁻¹

c_{w} = specific heat of water = 4186 J kg⁻¹ °C⁻¹

T_{hi} = initial temperature of the horseshoe = ?

T_{wi} = initial temperature of the water = 22 °C

T_{pi} = initial temperature of the iron pot = 22 °C

T_{f} = final temperature = 32 °C

Using conservation of Heat

m_{h}c_{i}(T_{hi} - T_{f}) = m_{w}c_{w}(T_{f} - T_{wi}) + m_{i}c_{i}(T_{f} - T_{pi})

(0.35)(450)(T_{hi} - 32) = (1.40)(4186)(32 - 22) + (0.45)(450)(32 - 22)

(157.5)(T_{hi} - 32) = 60629

T_{hi} - 32 = 384.95

T_{hi} = 420 °C

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Explanation:

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