Answer:
The players drops the ball either do to contact, the ball being stripped or personal error
Explanation:
Answer: 
Energy is directly proportional to the frequency.
The energy of a photon is given by:

Where, E is the energy and
is the frequency.
Frequency of the radio wave is given:


Multiply the above two:
Energy,

Hence, the energy of each photon of radio wave having frequency
is 
Answer:
Explanation:
Distance travelled by wave = 8 x 2 = 16 m
Time taken = 4 s
velocity of pulse wave = distance / time
= 16 m / 4 s
= 4 m/s
Answer:
Average speed, 
Explanation:
Given:
- Initial speed, u=40 cm/s
- final speed , v=20 cm/s
- Time taken, t=5 s
<u>First case</u>
Using equation of motion we have

Now using,

now putting the value of a in first equation we get

<u>Second case</u>
Acceleration
Time taken 
using equation of motion in one Dimension we have

Average speed is equal to total distance travelled per unit total time taken

B) All nonzero digits are significant.