Which of the following is/are correct about standing wave? i. It results from superimposed waves moving in same direction. ii. It is a sum of two…

Question

Which of the following is/are correct about standing wave? i. It results from superimposed waves moving in same direction. ii. It is a sum of two interfering light waves. iii. It is a vector sum of two reflected sound waves. iv. It can also be called stationary wave.

Answer 1

Which of the following is/are correct about standing wave? i. It results from superimposed waves moving in same direction. ii. It is a sum of two interfering light waves. iii. It is a vector sum of two reflected sound waves. iv. It can also be called stationary wave.

All of the above
i, ii and iv
iii and iv ✓
i and iii

Explanation

Subsistence agriculture: farmers grow food for family consumption, little surplus for sale. Commercial agriculture: large-scale production for market. Nigeria has both – subsistence dominates rural areas.

Intensive farming: high input (labor, fertilizer) per land unit. Extensive farming: large areas, low input per unit. Nomadic pastoralism: herders move with livestock seeking pasture and water.

Plantation agriculture: large-scale single crop (palm oil, rubber). Mixed farming: crops and livestock together. Crop choice depends on climate, soil, market access, and cultural preferences.