The distance from earth to the moon is approximately 3.84x10^5 km. how long would it take a radio wave with the frequency 7.25x10^5 hz to travel from earth to the moon

Given:

Distance from earth to moon (D)= 3.84*10⁵ km

Frequency of radio wave = 7.25*10⁵ Hz

To determine:

Time taken (T) for the radio wave to travel from earth to moon

Explanation:

The speed at which the radio wave travels = speed of light c = 3.0 *10⁸ m/s

Speed = Distance traveled/time take

Time taken = Distance/Speed = 3.84*10⁸ m/3.0*10⁸ ms-1

Time = 1.28 sec

Ans:  The time taken will be 1.28 sec and is independent of the frequency

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally