What is an echo? How is echo formed? - Vidyadip

Question

What is an echo? How is echo formed?

✓

Answer

Echo: The repetition of sound caused by the reflection of sound waves is called echo. An echo is produced when sound is reflected from a hard surface such as a tall brick wall or a cliff.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Que-Ans (Each of 2 Mark )" from Sound→Sound — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

The valencies (or charges) of some of the ions are given below:

Ion	Valency(Charges)	Ion	Valency(Charge)
Sodium ion	1+	Bromide ion	1-
Ammonium ion	1+	Hydroxide ion	1-
Calcium ion	2+	Sulphate ion	2-
Lead ion	2+	Phosphate ion	3-

Using this information, write down the formulate of the following compounds:

Sodium phosphate.
Ammonium sulphate.
Calcium hydroxide.
Lead bromide.

A bulb lights up when connected to a battery. State the energy change which takes place:

In the battery.
In the bulb.

Distinguish between the following pairs in one or two sentences for each:

Blood and lyrnph.

Bus X travels a distance of 360km in 5 hours whereas bus Y travels a distance of 476km in 7 hours. Which bus travels faster?

Give an example of third level causes of the disease.

Give two necessary conditions without which work is not said to be done in science.

A train starting from rest moves with a uniform acceleration of 0.2m/s² for 5 minutes. Calculate the speed acquired and the distance travelled in this time.

An aircraft travelling at 60km/h accelerates steadily at 10km/h per second. Taking the speed of sound as 1100km/h at the aircraft’s altitude, how long will it take to reach the ‘sound barrier’?

When is the work done said to be negative?

What is skeletal connective tissue? Give its functions.