Answer:
725.44 by 180.11
Explanation:
If a 100-ft tape was used, the number of such tapes in 725 ft would be
And in 180 ft would be
The same number of tapes would be used for the incorrect tape to give the false dimension. This would be
by
=
by
Answer:
Explanation:
We shall apply Doppler's effect here .
original frequency = 79.79 kHz
apparent frequency due to movement of source ( bat ) = 81.63 Hz
Let the velocity of bat be v .
expression for apparent frequency can be given as follows
n =
n is apparent frequency , n₀ is original frequency , V is velocity of light and v is velocity of source of sound
Putting the values
81.63 =
340-v = 332.33
v = 7.67 m /s
velocity of bat is 7.67 m /s .