Mechanical waves require a medium to travel, but electromagnetic waves do not.
Heat? I need more details but im sure it is heat.
<span>At where:
Q = amount of sensible heat (cal or J).
C = specific heat of the substance constituting the body (cal / g ° C or J / kg ° C).
M = body mass (g or kg).
Δθ = temperature variation (° C).
T = final temperature
To = Initial temperature
Data:
Q = 10 calories
M = 2 grams
C (ice)= 0.550 cal / g ° C
To = -30 ° C
T =?
Formula:
Q = m * c * Δθ
Resolution:
Substitute
Q = m * c * Δθ
10 = 2 * 0.550 * [T-To]
10 = 1.1 * [T-(-30)]
10 = 1.1 * [T+30]
10 = 1.1T + 33
-1.1T = 33 - 10
-1.1T = 23 .(-1)
1.1T = - 23
T = </span>
T ≈ - 20.90 ° C (the final temperature of the ice)
Answer:
240 meters
Explanation:
He is walking 2 meters per second, and there are 60 seconds per minute. There are 120 seconds in two minutes. So, 120 x 2 = 240. That's your answer!
Answer:
speed = 1.24 × 10⁸m/s
frequency = 4.74 × 10¹⁴Hz
wavelength = 262nm
Explanation:
the speed of the helium-neon light in zircon is given by,
v = c / n
c = 3 × 10⁸m/s is the speed of light in vacuum (and in air)
n = 2.419 is the refractive index of diamond
v = 3 × 10⁸ / 2.419
= 1.24 × 10⁸m/s
(b) Frequency
The wavelength of the light in air is:
λ₀ = 632.8 × 10⁻⁹
The frequency of the light does not depend on the medium, so it is equal in air and in diamond. Therefore, we can calculate the frequency by using the speed of light in air and the wavelength in air:
f₀ = c / λ₀
= 3 × 10⁸ / 632.8 × 10⁻⁹
= 4.74 × 10¹⁴Hz
and the frequency of the light indiamond is the same:
f¹ = f₀ = 4.74 × 10¹⁴Hz
(c) Wavelength
To calculate the wavelength of the light in daimond, we can use the relationship between speed of light in diamond and frequency:
λ¹ = v / f¹
= 1.24 × 10⁸ / 4.74 × 10¹⁴
= 2.62 × 10⁻⁷m
= 262nm
