Answer:
1.Ultrasound is a mechanical wave
2.Ultrasounds are sound waves having a frequency above 20,000Hz
3.ltrasound is not included in the electromagnetic spectrum
4.An ultrasound scan uses high-frequency sound waves to create images of the inside of the body
5.Therapeutic ultrasound has no known harmful effects when done right by your therapist
The answer is 5 mins. If the energy spent by a 100 W bulb for 35 min is the product of 100 X 35 which equals to 3500. With the microwave it'll take just 5 mins to consume that. (3500/700)
Answer:
t = 25s
Explanation:
The required temperature change is 50°C. (80 –30). The temperature of the bar increased 2°C in the first second. Assuming uniformity in the properties of the bar, in 2s the temperature would now be 2+2 = 4°C, in 3s it will be 2+2+2 =6°C.
So for gain a temperature change of 50°C, it will take 50/2 = 25s
ΔT /t = 2
t = ΔT/2 = 50/2 = 25seconds